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*Atoms*
**2018**,
*6*(3),
47;
https://doi.org/10.3390/atoms6030047

Article

Extended Analysis of Ar III and Ar IV

^{1}

Centro de Investigaciones Ópticas, M. B. Gonnet, P. O. Box 3, La Plata 1897, Argentina

^{2}

Departamento de Materia Condensada, Escuela de Física, Universidad Nacional Autónoma de Honduras, Tegucigalpa 11101, Honduras

^{*}

Author to whom correspondence should be addressed.

Received: 18 July 2018 / Accepted: 16 August 2018 / Published: 21 August 2018

## Abstract

**:**

A pulsed discharge light source was used to study the two and three times ionized argon (Ar II, Ar III) spectra in the 480–6218 Å region. A set of 129 transitions of Ar III and 112 transitions of Ar IV were classified for the first time. We extended the analysis of Ar III to five new energy levels belonging to 3s

^{2}3p^{3}4d, 3s^{2}3p^{3}5s odd configurations. For Ar IV, 10 new energy levels of the 3s^{2}3p^{2}3d and 3s^{2}3p^{2}4p even and odd configurations, respectively, are presented. For the prediction of energy levels, line transitions, and transition probabilities, relativistic Hartree–Fock calculations were used.Keywords:

atomic spectra; energy levels; capillary pulsed-discharge; relativistic Hartree–Fock calculations## 1. Introduction

Spectral analysis of several ions of argon has implications in different fields. In astrophysics [1,2,3], argon spectral lines are important in determining the chemical abundance of elements and estimating radiative transfer through stellar plasmas. Argon plasma sources are also applied in various fields of industry and research [4,5,6,7].

A compilation of energy levels and observed spectral lines of all ionization stages of Ar was reported in [8]. Many of the papers published on the spectra of two and three times ionized argon (Ar III, Ar IV) are cited in this work [8]. The report by Hansen and Persson [9] that presented a revised and extended analysis of the optical spectrum of Ar III is noteworthy. They used hollow cathode and theta-pinch sources analyzing the 3s

^{2}3p^{4}, 3s3p^{5}, 3p^{6}, 3s^{2}3p^{3}4s, 3s^{2}3p^{3}4p, and 3s^{2}3p^{3}3d configurations. Improved energy levels in this ion resulting from the best wavelengths in the literature in the range between 508 Å and 4183 Å were presented by Kaufman and Whaling [10]. For Ar IV, Bredice et al. [11] reanalyzed the 3s^{2}3p^{3}, 3s3p^{4}, 3s^{2}3p^{2}(3d + 4s) configurations to obtain new energy levels and classify new transitions. A more recent paper [12] presented an analysis of beam-foil and beam-gas excited spectrum of argon observed in the wavelength region 2965–3090 Å. New transitions in the spectrum of Ar III and Ar IV were also identified.In the last few decades [13,14,15,16,17,18], there has been intense research on determining and compiling the transition probabilities of ionized argon. In the work of Burger et al. [19], transition probabilities were presented for 38 Ar III and 14 Ar IV spectral lines from the wavelength interval 2400–3080 Å. These were compared to other papers reporting theoretical values [15,17]. In [15], Luna et al. used the Cowan code [20] carried out according to the relativistic Hartree–Fock (HF) approach.

To continue the study of the two and three times ionized argon spectra, a new spectral analysis of these ions is presented in this work. We used our experimental data of the argon spectrum covering the wavelength range 480–6218 Å for the visible ultraviolet (VUV) region. A set of 129 transitions of Ar III and 112 transitions of Ar IV were classified for the first time. Five new energy levels belonging to 3s

^{2}3p^{3}4d, 3s^{2}3p^{3}5s odd configurations of Ar III and 10 new energy levels of the 3s^{2}3p^{2}3d and 3s^{2}3p^{2}4p even and odd configurations, respectively, of Ar IV are presented. Theoretical predictions of the configuration structure and transition probabilities for the spectral lines were obtained from the computer code developed by Cowan [20]. The energy matrix was calculated using energy parameters adjusted to fit the experimental energy levels.## 2. Experimental Methods

The experimental data for argon were obtained at Centro de Investigaciones Opticas (CIOp). In order to excite the spectra, a capillary-pulsed discharge was used. It consisted of a Pyrex tube about 100 cm long, with an inner diameter of 0.5 cm. The electrodes, placed 80 cm apart, were made of tungsten and covered with indium. Gas excitation was produced by discharging a bank of low-inductance capacitors between 20 and 280 nF and charged up to 20 kV. To study the VUV region, one end of the tube was connected to a vacuum spectrograph and in this way a continuous flow of gas between the gas inlet and the spectrograph was established. Light emitted axially was recorded in the VUV and in the visible regions. In the VUV region, the light was analyzed using a 3 m normal incidence vacuum spectrograph with a concave diffraction grating with 1200 lines/mm and plate factor 2.77 Å/mm in the first diffraction order. To record the spectra, Ilford Q plates were used and known lines of carbon, nitrogen, oxygen, and different noble gas ions served as wavelength standards. The wavelength range above 2000 Å was observed using a diode array detector coupled to a 3.4 m Ebert plane-grating spectrograph with 600 lines/mm and a plate factor of 5 Å/mm in the first diffraction order. Photographic plates were used to record the spectra in the first, second, and third diffraction orders. Thorium lines from an electrodeless discharge were superimposed on the spectrograms and served as reference lines. To distinguish between different states of ionization, the gas pressure, discharge voltage, and number of discharges were varied. Wavelengths above 2000 Å were tabulated in air using the Edlén formula (Sections 1–4 in Reference [20]). The spectrograms were measured with a photoelectric semiautomatic Grant comparator, and the uncertainty in the determination of the wavelength of unperturbed lines was estimated to be ±0.02 Å in the VUV region and ±0.01 Å in the visible region. Energy level values derived from the observed lines were determined by means of an iterative procedure, which took into account the wave numbers of the lines, weighted by their estimated uncertainties. The uncertainty of the adjusted experimental energy level values was assumed to be lower than 2 cm

^{−1}.## 3. Results and Discussion

In the present work, we used Cowan’s atomic structure package [20], with corrections to the code made by Kramida [21] due to an error in Cowan’s atomic structure theory, to calculate the solution for relativistic Hartree–Fock (HF) equations including configuration interaction for Ar III and Ar IV. We adjusted the values of energy parameters to the experimental energy levels of these ions by means of a least squares calculation. With the adjusted values, we calculated the energy and composition of the levels, as well as the weighted transition probability rate gA [15,20], where g is the statistical weight 2J + 1 of the upper level. We present a revised and extended analysis of 3s

^{2}3p^{3}4d, 3s^{2}3p^{3}5s odd configurations for Ar III and of 3s^{2}3p^{2}3d and 3s^{2}3p^{2}4p even and odd configurations for Ar IV. The configuration sets used were 3s^{2}3p^{4}, 3s^{2}3p^{3}(4p,5p,6p), 3s^{2}3p^{3}(4f,5f), 3s3p^{4}3d, 3p^{6}, 3s^{2}3p^{2}3d^{2}and 3s3p^{5}, 3s^{2}3p^{3}(3d,4d,5d,6d), 3s^{2}3p^{3}(4s,5s,6s,7s) for Ar III even and odd parities, respectively, and 3s^{2}3p^{3}, 3s^{2}3p^{2}(4p,5p), 3p^{5}, 3s3p^{3}3d, 3s^{2}3p^{2}4f, 3s^{2}3p3d^{2}and 3s3p^{4}, 3s^{2}3p^{2}(3d,4d), 3s^{2}3p^{2}(4s,5s), 3s3p^{2}3d^{2}, 3p^{4}3d for Ar IV odd and even parities, respectively.Table 1 and Table 2 show the new and calculated energy level values for these ions with the percentage composition in LS notation. We report three new energy levels belonging to 3s

^{2}3p^{3}4d and two to 3s^{2}3p^{3}5s configurations of Ar III, and in Ar IV five new energy levels for 3s^{2}3p^{2}3d and five for 3s^{2}3p^{2}4p configurations. The calculated energy level values were obtained by least squares fit [20]. Our calculations included all the energy levels experimentally known.Table 3 and Table 4 show 23 and 53 new classified lines for Ar III and Ar IV, respectively, that were classified with the new levels presented in this work. We also present 106 and 59 new spectral lines for Ar III and Ar IV, respectively, corresponding to transitions with previously known levels. In these tables we also present gA transition probabilities to compare with the experimental intensity of the new observed lines. In the last columns of these tables we compare the values of gA with those of reference [16]. The observed differences could be due to the fact that weighted values of the energy parameters were used in our work and the calculations presented in reference [16] are ab initio, therefore the composition percentages of the experimental levels are different; besides, the set of configurations used is not exactly the same and there are effects of cancellation factors in our calculations (Sections 14 and 15 in Reference [20]).

The least squares calculation results are shown in Table 5, Table 6, Table 7 and Table 8 for Ar III and Ar IV. In Table 5 and Table 6, we show the radial parameters for the even and odd parity configurations of Ar III. In this calculation we also included the illegal-k effective-operator parameters F

^{k}(i,j) and G^{k}(i,j) (Section 16-7 in Reference [20]). In the case of 3s^{2}3p^{3}3d configuration for the odd parity, we set free the G^{2}(3p, 3d) parameter (there is no HF value for this parameter). The fitted value is in agreement with that published in [10]. In these tables, all the adjusted parameters that were set free are in good agreement with the scaled HF values. The parameter α was left free in the calculation and then fixed to its optimized value. The strong configuration interactions for the even parity (Table 5) between 3s^{2}3p^{4}–3s3p^{4}3d and 3s^{2}3p^{4}–3p^{6}configurations were optimized and fixed at 90%, 85%, and 70% of their HF values, respectively. For the odd parity (Table 6), the interaction integrals between 3s3p^{5}–3s^{2}3p^{3}3d and 3s^{2}3p^{3}3d–3s^{2}3p^{3}4d configurations were set free in the calculation. In the energy adjustment of Ar III, the standard deviation was 101 and 339 cm^{−1}for the even and odd parities, respectively.In Table 7 and Table 8, we show the radial parameters for the odd and even parity configurations of Ar IV. The adjusted parameters in these tables are in accordance with the scaled HF values. The parameter α was left free in the calculation and then fixed to its optimized value, except for the 3s

^{2}3p^{2}4s configuration, which was left fixed at the value of zero. The configuration interactions were set to 85% of their HF values. These values are omitted in Table 7 and Table 8. For the even configurations, the integral of interaction between 3s3p^{4}and 3s^{2}3p^{2}3d is significant, as it was seen in reference [11]. The standard deviation was 266 and 242 cm^{−1}for the odd and even parities, respectively.It should be mentioned that the accuracy in our calculations of the fitted values of the previously known energy levels are given according to the standard deviation for each of the parities in Ar III and Ar IV.

## 4. Conclusions

In this work we studied the Ar III and Ar IV spectra covering the wavelength range 480–6218 Å for the visible ultraviolet region using a pulsed electrical discharge. A set of 129 transitions of Ar III and 112 transitions of Ar IV were classified. Five new energy levels belonging to 3s

^{2}3p^{3}4d, 3s^{2}3p^{3}5s and 10 new energy levels of 3s^{2}3p^{2}3d, 3s^{2}3p^{2}4p for Ar III and Ar IV, respectively, were presented. Relativistic Hartree–Fock calculations were used. We considered optimized values of the energy parameters using least squares technique where we adjusted the theoretical parameter values to fit the experimental levels.## Author Contributions

Investigation, Writing-Original Draft Preparation, Conceptualization and Atomic calculation, M.R.; Software, R.E.M.C.; Formal Analysis, M.G.; Methodology and Investigation, J.R.A.

## Funding

This research received no external funding.

## Acknowledgments

This research was supported by the Consejo Nacional de Investigaciones Científicas y Técnicas, Argentina. The Comision de Investigaciones Científicas de la Provıncia de Buenos Aires (CIC), where M. Raineri is a researcher, is also gratefully acknowledged.

## Conflicts of Interest

The authors declare no conflict of interest.

## References

- Ziegler, M.; Rauch, T.; Werner, K.; Kruk, J.W.; Oliveira, C.M. FUV spectroscopy of the central star of planetary nebula Sh 2-216. Astrophys. Space Sci.
**2009**, 320, 257–260. [Google Scholar] [CrossRef] - Vermal, A.; Lutz, D.; Sturm, E.; Sternberg, A.; Genzel, R.; Vacca, W. A midinfrared spectroscopic survey of starburst galaxies: Excitation and abundances. Astron. Astrophys.
**2003**, 403, 829–846. [Google Scholar] [CrossRef] - Kunze, D.; Rigopoulou, D.; Lutz, D.; Egami, E.; Feuchtgruber, H.; Genzel, R.; Spoon, H.W.W.; Sturm, E.; Sternberg, A.; Moorwood, A.F.M.; et al. SWS spectroscopy of the colliding galaxies NGC4038/39. Astron. Astrophys.
**1996**, 315, L101–L104. [Google Scholar] - Celik, M. Spectral measurements of inductivity coupled and helicon discharge modes of a laboratory argon plasma source. Spectrochim. Acta Part B At. Spectrosc.
**2011**, 66, 149–155. [Google Scholar] [CrossRef] - Lotito, G.; Nelis, T.; Guillot, P.; Günther, D. Characterization of argon metastable species as function of time, space, and current of a pulsed DC glow discharge. Spectrochim. Acta Part B At. Spectrosc.
**2011**, 66, 619–626. [Google Scholar] [CrossRef] - Ma, Q.L.; Motto-Ros, V.; Lei, W.Q.; Boueri, M.; Bai, X.S.; Zheng, L.J.; Zeng, H.P.; Yu, J. Temporal and spatial dynamics of laser-induced aluminium plasma in argon background at atmospheric pressure: Interplay with the ambient gas. Spectrochim. Acta Part B At. Spectrosc.
**2010**, 65, 896–907. [Google Scholar] [CrossRef] - Kühn, G.; Könemann, F.; Kock, M. The role of Ar III in quantitative spectroscopy on hot argon plasma. J. Quant. Spectrosc. Radiat. Transf.
**2007**, 105, 102–110. [Google Scholar] [CrossRef] - Saloman, E.B. Energy Levels and Observed Spectral Lines of Ionized Argon, Ar II through Ar XVIII. J. Phys. Chem. Ref. Data
**2010**, 39, 033101. [Google Scholar] [CrossRef] - Hansen, J.E.; Persson, W. A revised analysis of the spectrum of Ar III. J. Phys. B
**1987**, 20, 693–706. [Google Scholar] [CrossRef] - Kaufman, V.; Whaling, W. Improved Wavelengths and Energy Levels of Doubly-Ionized Argon (Ar III). J. Res. Natl. Inst. Stand. Technol.
**1996**, 101, 691–704. [Google Scholar] [CrossRef] [PubMed] - Bredice, F.; Gallardo, M.; Reyna Almandos, J.G.; Trigueiros, A.G.; Pagan, C.J.B. Revised analysis of triply ionized argon (Ar IV). Phys. Scr.
**1995**, 51, 446–453. [Google Scholar] [CrossRef] - Nandi, T.; Mishra, A.P.; Jagatap, B.N. Observation of transitions involving core-excited states in Ar III and Ar IV and high-lying singly excited states in Ar I–Ar IV. J. Quant. Spectrosc. Radiat. Transf.
**2011**, 112, 2771–2778. [Google Scholar] [CrossRef] - Malone, B.S.; Corcoran, W.H. Transition probability measurements in the blue–near–U.V. spectrum of Ar I. J. Quant. Spectrosc. Radiat. Transf.
**1966**, 6, 443–449. [Google Scholar] [CrossRef] - Whaling, W.; Anderson, W.H.C.; Carle, M.T.; Brault, J.W.; Zarem, H.A. Argon ion line list and level energies in the hollow-cathode discharge. J. Quant. Spectrosc. Radiat. Transf.
**1995**, 53, 1–22. [Google Scholar] [CrossRef] - Luna, F.R.T.; Bredice, F.; Cavalcanti, G.H.; Trigueiros, A.G. Weighted oscillator strengths and lifetimes for the Ar III spectrum. J. Quant. Spectrosc. Radiat. Transf.
**2001**, 69, 171–188. [Google Scholar] [CrossRef] - Froese Fischer, C.; Tachiev, G.; Irimia, A. Relativistic energy levels, lifetimes, and transition probabilities for the sodium-like to argon-like sequences. At. Data Nucl. Data Tables
**2006**, 92, 607–812. [Google Scholar] [CrossRef] - NIST. Atomic Spectra Database Lines (Wavelength Ordered). 2011. Available online: /http://www.physics.nist.govS (accessed on 23 April 2018). [Google Scholar]
- Stancalie, V.; Pais, V.F.; Mihailescu, A. Contributors to the EFDA-TF-ITM. Fine-structure splitting calculation in the Ar III ion: Comparison of perturbative (Breit-Pauli) and non-perturbative (MCDF-EAL) predictions. Eur. Phys. J. D
**2012**, 66, 84–99. [Google Scholar] [CrossRef] - Burger, M.; Skočić, M.; Gavrilov, M.; Bukvić, S.; Djeniže, S. Experimental transition probabilities in the Ar III and Ar IV UV spectra. J. Quant. Spectrosc. Radiat. Transf.
**2012**, 113, 1662–1668. [Google Scholar] [CrossRef] - Cowan, R.D. The Theory of Atomic Structure and Spectra; University of California Press: Berkeley, CA, USA, 1981; ISBN 9780520038219. [Google Scholar]
- Kramida, A. Configuration interactions of class 11: An error in Cowan’s atomic structure theory. Comput. Phys. Commun.
**2017**, 215, 47–48. [Google Scholar] [CrossRef]

Configuration | Term | J | Exp Level (cm^{−1}) | Fitted ^{a} (cm^{−1}) | Composition ^{b} |
---|---|---|---|---|---|

3s^{2}3p^{3} (^{2}D°) 4d | ^{1}S° | 0 | 267,275.7 | 267,244 | 98 |

3s^{2}3p^{3} (^{2}P°) 4d | ^{1}F° | 3 | 286,381.9 | 286,375 | 78 3s^{2}3p^{3} (^{2}P°) 4d^{1}F° + 8 3s^{2}3p^{3} (^{2}D°) 5d^{1}F° |

3s^{2}3p^{3} (^{2}P°) 4d | ^{1}P° | 1 | 292,090.9 | 292,122 | 63 3s^{2}3p^{3} (^{2}P°) 4d^{1}P° + 18 3s^{2}3p^{3} (^{2}D°) 5d^{1}P° |

3s^{2}3p^{3} (^{2}D°) 5s | ^{1}D° | 2 | 272,655.2 | 272,636 | 57 3s^{2}3p^{3} (^{2}D°) 5s^{1}D° + 34 3s^{2}3p^{3} (^{2}D°) 4d^{1}D° |

3s^{2}3p^{3} (^{2}P°) 5s | ^{1}P° | 1 | 286,878.2 | 286,845 | 97 |

^{a}Calculated energy level values obtained using the fitted energy parameters.

^{b}Percentages below 5% have been omitted.

Configuration | Term | J | Exp Level (cm^{−1}) | Fitted ^{a} (cm^{−1}) | Composition ^{b} |
---|---|---|---|---|---|

3s^{2}3p^{2} (^{1}D) 3d | ^{2}F | ^{5}/_{2} | 185,795.6 | 185,870 | 46 3s^{2}3p^{2} (^{1}D) 3d ^{2}F + 39 3s^{2}3p^{2} (^{3}P) 3d ^{2}F |

3s^{2}3p^{2} (^{1}D) 3d | ^{2}F | ^{7}/_{2} | 186,451.8 | 186,591 | 44 3s^{2}3p^{2} (^{1}D) 3d ^{2}F + 31 3s^{2}3p^{2} (^{3}P) 3d ^{2}F |

3s^{2}3p^{2} (^{1}D) 3d | ^{2}P | ^{1}/_{2} | 245,175.2 | 245,287 | 57 3s^{2}3p^{2} (^{1}D) 3d^{2}P + 21 3s^{2}3p^{2} (^{3}P) 3d ^{2}P |

3s^{2}3p^{2} (^{1}S) 3d | ^{2}D | ^{5}/_{2} | 261,761.1 | 261,946 | 58 3s^{2}3p^{2} (^{1}S) 3d ^{2}D + 30 3s^{2}3p^{2} (^{3}P) 3d ^{2}D |

3s^{2}3p^{2} (^{1}S) 3d | ^{2}D | ^{3}/_{2} | 262,626.1 | 262,735 | 55 3s^{2}3p^{2} (^{1}S) 3d ^{2}D + 31 3s^{2}3p^{2} (^{3}P) 3d ^{2}D |

3s^{2}3p^{2} (^{3}P) 4p | ^{2}S° | ^{1}/_{2} | 282,726.0 | 282,596 | 98 |

3s^{2}3p^{2} (^{1}D)4p | ^{2}P° | ^{1}/_{2} | 311,018.3 | 310,973 | 87 3s^{2}3p^{2} (^{1}D) 4p^{2}P° + 10 3s^{2}3p^{2} (^{3}P) 4p^{2}P° |

3s^{2}3p^{2} (^{1}D)4p | ^{2}P° | ^{3}/_{2} | 311,276.3 | 311,201 | 76 3s^{2}3p^{2} (^{1}D) 4p^{2}P° + 123s^{2}3p^{2} (^{3}P) 4p^{2}P° |

3s^{2}3p^{2} (^{1}S)4p | ^{2}P° | ^{1}/_{2} | 327,113.4 | 327,126 | 96 |

3s^{2}3p^{2} (^{1}S)4p | ^{2}P° | ^{3}/_{2} | 327,388.9 | 327,333 | 96 |

^{a}Calculated energy level values obtained using the fitted energy parameters.

^{b}Percentages below 5% have been omitted.

Rel. Int. | Observed Wavelength Vac (Å) | Wavenumber (cm^{−1}) σ_{obs} | Lower Level Conf. Term, J | Upper Level Conf. Term, J | gA (s^{−1}) | gA (s [16]^{−1}) Reference | ||||

3 | 764.09 | 130,875 | 3s^{2}3p^{4} | ^{1}D | 2 | 3s^{2}3p^{3} (^{4}S°) 3d | ^{5}D° | 1 | 4.12 × 10^{4} | 2.20 × 10^{5} |

4 | 790.77 | 126,459 | 3s3p^{5} | ^{3}P° | 2 | 3s^{2}3p^{3} (^{2}P°) 4p | ^{3}D | 2 | 1.74 × 10^{7} | 3.22 × 10^{7} |

8 | 797.48 | 125,395 | 3s3p^{5} | ^{3}P° | 2 | 3s^{2}3p^{3} (^{2}P°) 4p | ^{3}S | 1 | 1.77 × 10^{8} | 4.35 × 10^{8} |

6 | 797.75 | 125,353 | 3s3p^{5} | ^{3}P° | 1 | 3s^{2}3p^{3} (^{2}P°) 4p | ^{3}D | 1 | 1.96 × 10^{7} | 3.64 × 10^{7} |

7 | 803.88 | 124,397 | 3s3p^{5} | ^{3}P° | 1 | 3s^{2}3p^{3} (^{2}P°) 4p | ^{3}S | 1 | 1.60 × 10^{8} | 3.95 × 10^{8} |

2 | 807.32 | 123,867 | 3s3p^{5} | ^{3}P° | 0 | 3s^{2}3p^{3} (^{2}P°) 4p | ^{3}S | 1 | 6.66 × 10^{7} | 3.52 × 10^{7} |

1 | 817.90 | 122,264 | 3s3p^{5} | ^{3}P° | 2 | 3s^{2}3p^{3} (^{2}D°) 4p | ^{1}D | 2 | 1.18 × 10^{6} | |

2 | 855.01 | 116,958 | 3s3p^{5} | ^{3}P° | 1 | 3s^{2}3p^{3} (^{2}D°) 4p | ^{3}P | 0 | 8.33 × 10^{7} | 2.18 × 10^{8} |

6 | 855.94 | 116,831 | 3s3p^{5} | ^{3}P° | 1 | 3s^{2}3p^{3} (^{2}D°) 4p | ^{3}P | 1 | 3.96 × 10^{7} | 1.21 × 10^{8} |

3 | 887.30 | 112,702 | 3s3p^{5} | ^{3}P° | 2 | 3s^{2}3p^{3} (^{2}D°) 4p | ^{3}F | 3 | 1.25 × 10^{7} | 9.22 × 10^{6} |

7 | 896.02 | 111,605 | 3s3p^{5} | ^{3}P° | 2 | 3s^{2}3p^{3} (^{2}D°) 4p | ^{3}D | 3 | 5.62 × 10^{7} | 1.78 × 10^{8} |

3 | 896.37 | 111,561 | 3s3p^{5} | ^{3}P° | 1 | 3s^{2}3p^{3} (^{2}D°) 4p | ^{3}F | 2 | 2.82 × 10^{6} | |

6 | 906.18 | 110,353 | 3s3p^{5} | ^{3}P° | 1 | 3s^{2}3p^{3} (^{2}D°) 4p | ^{3}D | 2 | 2.65 × 10^{7} | 9.18 × 10^{7} |

2 | 910.22 | 109,864 | 3s3p^{5} | ^{3}P° | 2 | 3s^{2}3p^{3} (^{2}D°) 4p | ^{1}P | 1 | 8.82 × 10^{3} | |

2 | 1019.59 | 98,079 | 3s^{2}3p^{3} (^{4}S°) 3d | ^{3}D° | 1 | 3s^{2}3p^{3} (^{2}P°) 4p | ^{1}S | 0 | 1.13 × 10^{6} | |

6 | 1048.67 | 95,359 * | 3s^{2}3p^{3} (^{4}S°) 3d | ^{5}D° | 2 | 3s^{2}3p^{3} (^{2}D°) 4p | ^{3}D | 2 | 1.85 × 10^{5} | |

6 | 1048.67 | 95,359 * | 3s^{2}3p^{3} (^{4}S°) 3d | ^{5}D° | 3 | 3s^{2}3p^{3} (^{2}D°) 4p | ^{3}D | 2 | 9.23 × 10^{3} | |

3 | 1143.62 | 87,442 | 3s^{2}3p^{3} (^{4}S°) 3d | ^{3}D° | 3 | 3s^{2}3p^{3} (^{2}P°) 4p | ^{1}D | 2 | 3.14 × 10^{5} | |

8 | 1151.15 | 86,870 | 3s^{2}3p^{3} (^{4}S°) 3d | ^{5}D° | 1 | 3s^{2}3p^{3} (^{2}D°) 4p | ^{3}P | 0 | 2.96 × 10^{4} | |

3 | 1152.92 | 86,736 | 3s^{2}3p^{3} (^{4}S°) 3d | ^{5}D° | 2 | 3s^{2}3p^{3} (^{2}D°) 4p | ^{3}P | 1 | 7.69 × 10^{4} | |

4 | 1156.63 | 86,458 | 3s^{2}3p^{3} (^{4}S°) 3d | ^{5}D° | 1 | 3s^{2}3p^{3} (^{2}D°) 4p | ^{3}P | 2 | 6.57 × 10^{4} | |

1 | 1225.27 | 81,615 | 3s^{2}3p^{3} (^{4}S°) 3d | ^{5}D° | 2 | 3s^{2}3p^{3} (^{2}D°) 4p | ^{3}F | 3 | 5.61 × 10^{4} | |

6 | 1226.52 | 81,532 | 3s^{2}3p^{4} | ^{1}S | 0 | 3s3p^{5} | ^{3}P° | 1 | 2.33 × 10^{5} | |

2 | 1227.88 | 81,441 | 3s^{2}3p^{3} (^{4}S°) 4p | ^{5}P | 1 | 3s^{2}3p^{3} (^{2}P°) 5s | ^{3}P° | 2 | 2.80 × 10^{5} | |

1 | 1231.13 | 81,226 | 3s^{2}3p^{3} (^{4}S°) 4p | ^{5}P | 2 | 3s^{2}3p^{3} (^{2}P°) 5s | ^{3}P° | 1 | 2.36 × 10^{3} | |

9 | 1232.52 | 81,135 | 3s3p^{5} | ^{1}P° | 1 | 3s^{2}3p^{3} (^{2}D°) 4p | ^{3}D | 1 | 9.26 × 10^{7} | |

1 | 1246.07 | 80,252 | 3s^{2}3p^{3} (^{4}S°) 3d | ^{5}D° | 3 | 3s^{2}3p^{3} (^{2}D°) 4p | ^{3}D | 2 | 9.23 × 10^{3} | |

1 | 1287.22 | 77,687 | 3s^{2}3p^{3} (^{4}S°) 4p | ^{3}P | 1 | 3s^{2}3p^{3} (^{2}P°) 5s | ^{1}P° | 1 | 5.26 × 10^{5} | |

4 | 1294.84 | 77,232 | 3s^{2}3p^{3} (^{4}S^{0}) 4p | ^{3}P | 2 | 3s^{2}3p^{3} (^{2}P°) 4d | ^{1}F° | 3 | 3.74 × 10^{5} | |

9 | 1308.25 | 76,438 | 3s^{2}3p^{3} (^{2}D°) 3d | ^{3}F° | 2 | 3s^{2}3p^{3} (^{2}P°) 4p | ^{3}S | 1 | 9.63 × 10^{5} | |

2 | 1382.71 | 72,322 | 3s^{2}3p^{3} (^{4}S°) 4p | ^{3}P | 2 | 3s^{2}3p^{3} (^{2}P°) 4d | ^{3}F° | 3 | 1.03 × 10^{5} | |

6 | 1461.38 | 68,428 | 3s^{2}3p^{3} (^{2}D°) 4p | ^{1}P | 1 | 3s^{2}3p^{3} (^{2}P°) 4d | ^{1}P° | 1 | 1.90 × 10^{8} | |

1 | 1478.87 | 67,619 | 3s^{2}3p^{3} (^{4}S°) 4p | ^{5}P | 1 | 3s^{2}3p^{3} (^{2}D°) 5s | ^{3}D° | 2 | 3.02 × 10^{3} | |

1 | 1479.33 | 67,598 | 3s^{2}3p^{3} (^{4}S°) 4p | ^{5}P | 2 | 3s^{2}3p^{3} (^{2}D°) 5s | ^{3}D° | 3 | 1.19 × 10^{5} | |

1 | 1498.21 | 66,746 | 3s^{2}3p^{3} (^{4}S°) 3d | ^{3}D° | 2 | 3s^{2}3p^{3} (^{2}D°) 4p | ^{1}P | 1 | 1.56 × 10^{7} | |

7 | 1498.38 | 66,739 | 3s^{2}3p^{3} (^{4}S°) 3d | ^{3}D° | 2 | 3s^{2}3p^{3} (^{2}D°) 4p | ^{1}P | 1 | 8.52 × 10^{7} | |

1 | 1501.77 | 66,588 | 3s^{2}3p^{3} (^{2}P°) 3d | ^{3}P° | 1 | 3s^{2}3p^{3} (^{2}P°) 4p | ^{1}S | 0 | 1.92 × 10^{3} | |

3 | 1517.15 | 65,913 | 3s^{2}3p^{3} (^{4}S°) 4s | ^{5}S° | 2 | 3s^{2}3p^{3} (^{2}P°) 4p | ^{3}D | 3 | 4.39 × 10^{6} | |

1 | 1551.71 | 64,445 | 3s^{2}3p^{3} (^{4}S°) 4p | ^{5}P | 1 | 3s^{2}3p^{3} (^{2}D°) 4d | ^{3}D° | 2 | 2.90 × 10^{5} | |

2 | 1565.07 | 63,895 | 3s^{2}3p^{3} (^{4}S°) 4s | ^{3}S° | 1 | 3s^{2}3p^{3} (^{2}P°) 4p | ^{3}P | 2 | 2.47 × 10^{7} | 3.17 × 10^{7} |

2 | 1583.54 | 63,150 | 3s^{2}3p^{3} (^{2}D°) 4p | ^{1}P | 1 | 3s^{2}3p^{3} (^{2}P°) 5s | ^{1}P° | 1 | 3.88 × 10^{7} | |

1 | 1584.74 | 63,102 | 3s^{2}3p^{3} (^{4}S°) 4p | ^{3}P | 2 | 3s^{2}3p^{3} (^{2}D°) 5s | ^{3}D° | 3 | 1.63 × 10^{6} | |

2 | 1621.91 | 61,656 | 3s^{2}3p^{3} (^{2}D°) 4p | ^{3}D | 1 | 3s^{2}3p^{3} (^{2}P°) 5s | ^{1}P° | 1 | 6.94 × 10^{6} | |

3 | 1641.85 | 60,907 | 3s^{2}3p^{3} (^{2}D°) 3d | ^{1}S° | 0 | 3s^{2}3p^{3} (^{2}D°) 4p | ^{1}P | 1 | 1.96 × 10^{8} | |

1 | 1646.50 | 60,735 | 3s^{2}3p^{3} (^{2}D°) 4p | ^{3}D | 2 | 3s^{2}3p^{3} (^{2}P°) 5s | ^{3}P° | 1 | 2.50 × 10^{7} | |

2 | 1654.12 | 60,455 | 3s^{2}3p^{3} (^{2}D°) 4p | ^{1}P | 1 | 3s^{2}3p^{3} (^{2}P°) 4d | ^{3}D° | 1 | 2.16 × 10^{4} | |

2 | 1657.39 | 60,336 | 3s^{2}3p^{3} (^{2}D^{0}) 4p | ^{3}P | 0 | 3s^{2}3p^{3}(^{2}P°) 4d | ^{1}P° | 1 | 7.81 × 10^{5} | |

2 | 1670.10 | 59,877 | 3s^{2}3p^{3} (^{2}D^{0}) 4p | ^{3}F | 3 | 3s^{2}3p^{3} (^{2}P°) 4d | ^{1}F° | 3 | 3.57 × 10^{4} | |

3 | 1674.09 | 59,734 | 3s^{2}3p^{3} (^{2}D^{0}) 4p | ^{3}F | 4 | 3s^{2}3p^{3} (^{2}P°) 4d | ^{1}F° | 3 | 4.57 × 10^{4} | |

1 | 1756.05 | 56,946 | 3s^{2}3p^{3} (^{2}D°) 4p | ^{3}D | 1 | 3s^{2}3p^{3} (^{2}P°) 4d | ^{3}P° | 2 | 3.39 × 10^{6} | |

1 | 1758.89 | 56,854 | 3s^{2}3p^{3} (^{2}D°) 4p | ^{3}D | 2 | 3s^{2}3p^{3} (^{2}P°) 4d | ^{3}P° | 1 | 4.34 × 10^{3} | |

2 | 1784.86 | 56,026 | 3s^{2}3p^{3} (^{2}D^{0}) 4p | ^{1}D | 2 | 3s^{2}3p^{3}(^{2}P°) 4d | ^{1}P^{0} | 1 | 6.97 × 10^{5} | |

1 | 1818.15 | 55,001 | 3s^{2}3p^{3} (^{2}P°) 3d | ^{3}P° | 1 | 3s^{2}3p^{3} (^{2}P°) 4p | ^{3}P | 1 | 3.07 × 10^{7} | 4.91 × 10^{7} |

2 | 1821.26 | 54,907 | 3s^{2}3p^{3} (^{2}P°) 3d | ^{3}P° | 2 | 3s^{2}3p^{3} (^{2}P°) 4p | ^{3}P | 2 | 2.59 × 10^{8} | 3.19 × 10^{8} |

2 | 1833.45 | 54,542 | 3s^{2}3p^{3} (^{2}D°) 4p | ^{3}P | 2 | 3s^{2}3p^{3} (^{2}P°) 5s | ^{3}P° | 1 | 1.12 × 10^{7} | |

1 | 1877.34 | 53,267 | 3s^{2}3p^{3} (^{2}D°) 3d | ^{3}G° | 4 | 3s^{2}3p^{3} (^{2}D°) 4p | ^{3}D | 3 | 1.39 × 10^{8} | 3.84 × 10^{7} |

1 | 1885.05 | 53,049 | 3s^{2}3p^{3} (^{2}D°) 3d | ^{3}G° | 3 | 3s^{2}3p^{3} (^{2}D°) 4p | ^{3}D | 2 | 4.94 × 10^{7} | 1.79 × 10^{7} |

3 | 1925.40 | 51,939 | 3s^{2}3p^{3}(^{2}P°) 4p | ^{3}D | 1 | 3s^{2}3p^{3} (^{2}P°) 4d | ^{1}P° | 1 | 1.54 × 10^{7} | |

1 | 1967.80 | 50,818 | 3s^{2}3p^{3} (^{2}D°) 4p | ^{1}D | 2 | 3s^{2}3p^{3} (^{2}P°) 5s | ^{1}P^{0} | 1 | 3.98 × 10^{7} | |

Observed Wavelength Air (Å) | ||||||||||

6 | 2041.2 | 48,991 | 3s^{2}3p^{3} (^{2}D^{0}) 4p | ^{1}P | 1 | 3s^{2}3p^{3} (^{2}D°) 5s | ^{1}D° | 2 | 1.67 × 10^{9} | |

1 | 2339.23 | 42,736.0 | 3s^{2}3p^{3} (^{2}P°) 4p | ^{3}P | 1 | 3s^{2}3p^{3} (^{2}P°) 5s | ^{3}P° | 1 | 1.73 × 10^{8} | |

2 | 2351.80 | 42,521 | 3s^{2}3p^{3} (^{2}P°) 4p | ^{1}D | 2 | 3s^{2}3p^{3} (^{2}P°) 5s | ^{1}P° | 1 | 1.30 × 10^{9} | |

5 | 2378.82 | 42,024.7 | 3s^{2}3p^{3} (^{2}P°) 4p | ^{1}D | 2 | 3s^{2}3p^{3} (^{2}P°) 4d | ^{1}F° | 3 | 5.30 × 10^{9} | |

2 | 2394.85 | 41,743.6 | 3s^{2}3p^{3} (^{2}P°) 4p | ^{3}D | 2 | 3s^{2}3p^{3} (^{2}P°) 4d | ^{3}P° | 1 | 1.46 × 10^{6} | |

4 | 2572.92 | 38,854.7 | 3s^{2}3p^{3} (^{2}P°) 4p | ^{3}P | 1 | 3s^{2}3p^{3} (^{2}P°) 4d | ^{3}P° | 1 | 1.24 × 10^{8} | |

1 | 2628.26 | 38,036.6 | 3s^{2}3p^{3} (^{2}P°) 4p | ^{3}P | 2 | 3s^{2}3p^{3} (^{2}P°) 4d | ^{3}F° | 2 | 5.33 × 10^{6} | |

1 | 2710.09 | 36,888.2 | 3s^{2}3p^{3} (^{4}S°) 4p | ^{3}P | 2 | 3s23p^{3} (^{4}S°)4d | ^{5}D° | 3 | 1.39 × 10^{6} | |

2 | 2710.36 | 36,884.5 | 3s^{2}3p^{3} (^{2}P°) 4p | ^{1}S | 0 | 3s^{2}3p^{3} (^{2}P°) 4d | ^{1}P° | 1 | 4.38 × 10^{8} | |

9 | 2767.39 | 36,124.5 | 3s^{2}3p^{3} (^{2}D°) 4p | ^{1}D | 2 | 3s^{2}3p^{3} (^{2}D°) 5s | ^{3}D° | 2 | 1.42 × 10^{7} | |

3 | 2771.92 | 36,065.4 | 3s^{2}3p^{3} (^{2}D°) 4p | ^{1}D | 2 | 3s^{2}3p^{3} (^{2}D°) 5s | ^{3}D° | 1 | 1.58 × 10^{6} | |

4 | 2804.36 | 35,648.3 | 3s^{2}3p^{3} (^{2}D°) 4p | ^{3}P | 1 | 3s^{2}3p^{3} (^{2}D°)4d | ^{1}S° | 0 | 1.51 × 10^{6} | |

4 | 2891.46 | 34,574.5 | 3s^{2}3p^{3} (^{2}P°) 4s | ^{3}P° | 2 | 3s^{2}3p^{3} (^{2}P°) 4p | ^{1}P | 1 | 2.61 × 10^{7} | |

2 | 3037.25 | 32,914.9 | 3s^{2}3p^{3} (^{2}D°) 4p | ^{1}D | 2 | 3s^{2}3p^{3} (^{2}P°) 4d | ^{3}D° | 1 | 2.00 × 10^{6} | |

9 | 3048.47 | 32,793.8 | 3s^{2}3p^{3} (^{2}P°) 3d | ^{3}D° | 1 | 3s^{2}3p^{3} (^{2}P°) 4p | ^{1}D | 2 | 7.18 × 10^{6} | |

1 | 3075.70 | 32,503.5 * | 3s^{2}3p^{3} (^{2}P°) 4p | ^{3}S | 1 | 3s^{2}3p^{3} (^{2}D°)4d | ^{3}P^{0} | 0 | 6.26 × 10^{4} | |

1 | 3075.70 | 32,503.5 * | 3s^{2}3p^{3} (^{2}P°) 4p | ^{3}D | 1 | 3s^{2}3p^{3} (^{2}D°) 5s | ^{1}D° | 2 | 6.94 × 10^{5} | |

3 | 3089.03 | 32,363.2 | 3s^{2}3p^{3} (^{2}P°) 4p | ^{3}D | 3 | 3s^{2}3p^{3} (^{2}D°) 5s | ^{1}D° | 2 | 4.64 × 10^{3} | |

2 | 3120.41 | 32,037.8 | 3s^{2}3p^{3} (^{2}P°) 4p | ^{3}D | 1 | 3s^{2}3p^{3} (^{2}D°)5s | ^{3}D^{0} | 2 | 5.91 × 10^{6} | |

4 | 3132.13 | 31,917.9 | 3s^{2}3p^{3} (^{2}P°) 4p | ^{3}D | 1 | 3s^{2}3p^{3} (^{2}D°)4d | ^{3}S° | 1 | 6.40 × 10^{5} | |

1 | 3137.82 | 31,860.0 | 3s^{2}3p^{3} (^{2}P°)3d | ^{3}D° | 1 | 3s^{2}3p^{3} (^{2}P°) 4p | ^{3}P | 2 | 1.12 × 10^{6} | 1.04 × 10^{7} |

6 | 3140.30 | 31,834.9 | 3s^{2}3p^{3} (^{2}P°) 4p | ^{3}D | 2 | 3s^{2}3p^{3} (^{2}D°) 4d | ^{1}D° | 2 | 1.30 × 10^{7} | |

7 | 3199.08 | 31,250.0 | 3s^{2}3p^{3} (^{2}P°) 4p | ^{3}D | 2 | 3s^{2}3p^{3} (^{2}D°) 4d | ^{3}P° | 2 | 1.04 × 10^{5} | |

6 | 3245.58 | 30,802.3 | 3s^{2}3p^{3} (^{2}P°) 3d | ^{3}D° | 2 | 3s^{2}3p^{3} (^{2}P°) 4p | ^{1}P | 1 | 4.11 × 10^{7} | 1.58 × 10^{7} |

2 | 3290.37 | 30,383.0 | 3s^{2}3p^{3} (^{2}P°) 4p | ^{1}P | 1 | 3s^{2}3p^{3} (^{2}D°) 5s | ^{3}D° | 2 | 1.33 × 10^{7} | |

8 | 3300.95 | 30,285.6 | 3s^{2}3p^{3} (^{2}P°) 4p | ^{1}P | 1 | 3s^{2}3p^{3} (^{2}D°) 4d | ^{1}D° | 2 | 4.58 × 10^{7} | |

8 | 3352.49 | 29,820.0 | 3s^{2}3p^{3} (^{2}P°) 4p | ^{3}S | 1 | 3s^{2}3p^{3} (^{2}D°) 4d | ^{3}D° | 2 | 2.00 × 10^{6} | |

2 | 3356.47 | 29,784.7 | 3s^{2}3p^{3} (^{2}P°) 4p | ^{3}S | 1 | 3s^{2}3p^{3} (^{2}D°)4d | ^{3}D° | 1 | 5.91 × 10^{5} | |

2 | 3373.35 | 29,635.6 | 3s^{2}3p^{3} (^{2}P°)3d | ^{1}D° | 2 | 3s^{2}3p^{3} (^{4}S°) 4p | ^{3}P | 2 | 1.34 × 10^{2} | |

7 | 3387.85 | 29,508.8 | 3s^{2}3p^{3} (^{2}P°) 4p | ^{3}P | 1 | 3s^{2}3p^{3} (^{2}D°) 5s | ^{1}D° | 2 | 1.14 × 10^{6} | |

2 | 3420.12 | 29,230.4 | 3s^{2}3p^{3} (^{2}P°) 4p | ^{3}P | 2 | 3s^{2}3p^{3} (^{2}D°) 5s | ^{1}D° | 2 | 7.43 × 10^{5} | |

4 | 3442.18 | 29,043.0 | 3s^{2}3p^{3} (^{2}P°) 4p | ^{3}P | 1 | 3s^{2}3p^{3} (^{2}D°) 5s | ^{3}D° | 2 | 1.59 × 10^{7} | |

1 | 3445.79 | 29,012.6 | 3s^{2}3p^{3} (^{2}P°) 4p | ^{1}S | 0 | 3s^{2}3p^{3} (^{2}P°) 4d | ^{3}D° | 1 | 1.81 × 10^{6} | |

3 | 3449.32 | 28,982.9 | 3s^{2}3p^{3} (^{2}P°) 4p | ^{3}P | 1 | 3s^{2}3p^{3} (^{2}D°) 5s | ^{3}D° | 1 | 8.36 × 10^{6} | |

2 | 3453.61 | 28,946.9 | 3s^{2}3p^{3} (^{2}P°) 4p | ^{3}P | 1 | 3s^{2}3p^{3} (^{2}D°) 4d | ^{1}D° | 2 | 2.18 × 10^{7} | |

5 | 3456.48 | 28,922.9 | 3s^{2}3p^{3} (^{2}P°) 4p | ^{3}P | 1 | 3s^{2}3p^{3} (^{2}D°) 4d | ^{3}S° | 1 | 2.61 × 10^{7} | |

2 | 3463.81 | 28,861.7 | 3s^{2}3p^{3} (^{2}P°) 4p | ^{3}D | 1 | 3s^{2}3p^{3} (^{2}D°) 4d | ^{3}D° | 2 | 5.00 × 10^{6} | |

6 | 3467.98 | 28,827.0 * | 3s^{2}3p^{3} (^{2}P°) 4p | ^{3}D | 1 | 3s^{2}3p^{3} (^{2}D°) 4d | ^{3}D° | 1 | 1.83 × 10^{7} | |

6 | 3467.98 | 28,827.0 * | 3s^{2}3p^{3} (^{2}P°) 4p | ^{3}P | 2 | 3s^{2}3p^{3} (^{2}D°) 5s | ^{3}D° | 3 | 4.58 × 10^{7} | |

7 | 3482.15 | 28,709.7 | 3s^{2}3p^{3} (^{2}P°)4p | ^{3}D | 3 | 3s^{2}3p^{3} (^{2}D°) 4d | ^{3}D° | 3 | 5.48 × 10^{7} | |

6 | 3490.12 | 28,644.1 | 3s^{2}3p^{3} (^{2}P°) 4p | ^{3}P | 2 | 3s^{2}3p^{3} (^{2}D°) 4d | ^{3}S° | 1 | 2.71 × 10^{7} | |

2 | 3501.57 | 28,550.5 | 3s^{2}3p^{3} (^{2}P°) 4p | ^{3}P | 1 | 3s^{2}3p^{3} (^{2}D°) 4d | ^{3}P° | 0 | 8.20 × 10^{6} | |

3 | 3504.54 | 28,526.3 | 3s^{2}3p^{3} (^{2}P°) 4p | ^{3}P | 1 | 3s^{2}3p^{3} (^{2}D°) 4d | ^{3}P° | 1 | 7.90 × 10^{5} | |

1 | 3524.86 | 28,361.8 | 3s^{2}3p^{3} (^{2}P°) 4p | ^{3}P | 1 | 3s^{2}3p^{3} (^{2}D°) 4d | ^{3}P° | 2 | 3.55 × 10^{6} | |

7 | 3532.92 | 28,297.1 | 3s^{2}3p^{3} (^{2}P°) 4p | ^{1}D | 2 | 3s^{2}3p^{3} (^{2}D°) 5s | ^{1}D° | 2 | 6.12 × 10^{7} | |

6 | 3546.52 | 28,188.6 | 3s^{2}3p^{3} (^{2}P°) 3d | ^{3}D° | 2 | 3s^{2}3p^{3} (^{2}P°) 4p | ^{3}S | 1 | 1.13 × 10^{7} | |

7 | 3557.68 | 28,100.2 | 3s^{2}3p^{3} (^{4}S°) 4p | ^{3}P | 2 | 3s^{2}3p^{3} (^{2}P°) 3d | ^{1}P° | 1 | 1.27 × 10^{4} | |

8 | 3559.94 | 28,082.3 * | 3s^{2}3p^{3} (^{2}P°) 4p | ^{3}P | 2 | 3s^{2}3p^{3} (^{2}D°) 4d | ^{3}P° | 2 | 6.00 × 10^{6} | |

8 | 3559.94 | 28,082.3 * | 3s^{2}3p^{3} (^{2}P°) 4p | ^{3}S | 1 | 3s^{2}3p^{3} (^{2}D°)4d | ^{1}S° | 0 | 6.15 × 10^{5} | |

1 | 3604.60 | 27,734.4 | 3s^{2}3p^{3} (^{2}P°) 4p | ^{1}D | 2 | 3s^{2}3p^{3} (^{2}D°) 4d | ^{1}D° | 2 | 1.72 × 10^{7} | |

3 | 3618.28 | 27,629.6 | 3s^{2}3p^{3} (^{2}P°) 3d | ^{3}D° | 1 | 3s^{2}3p^{3} (^{2}P°) 4p | ^{3}S | 1 | 3.69 × 10^{6} | |

8 | 3632.13 | 27,524.2 | 3s^{2}3p^{3} (^{2}P°)4p | ^{3}D | 2 | 3s^{2}3p^{3} (^{2}D°) 4d | ^{3}G° | 3 | 7.87 × 10^{5} | |

2 | 3674.63 | 27,205.9 | 3s^{2}3p^{3} (^{2}P°)4p | ^{1}P | 1 | 3s^{2}3p^{3} (^{2}D°) 4d | ^{3}D° | 2 | 2.00 × 10^{4} | |

2 | 3787.06 | 26,398.2 | 3s^{2}3p^{3} (^{2}P°) 4p | ^{1}D | 2 | 3s^{2}3p^{3} (^{2}D°) 4d | ^{1}P° | 1 | 2.28 × 10^{7} | |

2 | 3908.78 | 25,576.2 | 3s^{2}3p^{3} (^{2}P°) 4p | ^{3}P | 2 | 3s^{2}3p^{3} (^{2}D°) 4d | ^{3}D° | 3 | 1.22 × 10^{6} | |

5 | 3978.72 | 25,126.6 | 3s^{2}3p^{3} (^{2}P°) 3d | ^{1}D° | 2 | 3s^{2}3p^{3} (^{4}S°) 4p | ^{5}P | 2 | 4.49 × 10^{2} | |

3 | 3989.35 | 25,059.7 | 3s^{2}3p^{3} (^{2}P°) 3d | ^{3}D° | 2 | 3s^{2}3p^{3} (^{2}D°) 4p | ^{1}D | 2 | 2.21 × 10^{6} | |

3 | 3998.77 | 25,000.6 | 3s^{2}3p^{3} (^{2}P°)4s | ^{1}P° | 1 | 3s^{2}3p^{3} (^{2}D°) 4p | ^{1}D | 2 | 5.83 × 10^{6} | 9.23 × 10^{6} |

4 | 4012.31 | 24,916.3 | 3s^{2}3p^{3} (^{2}D°) 4p | ^{1}P | 1 | 3s^{2}3p^{3} (^{2}D°) 4d | ^{3}F° | 2 | 5.69 × 10^{4} | |

7 | 4143.38 | 24,128.1 | 3s^{2}3p^{3} (^{2}P°) 4p | ^{3}P | 1 | 3s^{2}3p^{3} (^{2}D°) 4d | ^{1}S° | 0 | 5.46 × 10^{6} | |

1 | 4520.87 | 22,113.4 | 3s^{2}3p^{3} (^{2}D°)3d | ^{3}P° | 2 | 3s^{2}3p^{3} (^{2}D°) 4p | ^{1}D | 2 | 1.47 × 10^{6} | |

6 | 4553.69 | 21,954.1 | 3s^{2}3p^{3} (^{2}D°)3d | ^{3}D° | 1 | 3s^{2}3p^{3} (^{4}S°) 4p | ^{3}P | 1 | 5.49 × 10^{6} | 1.68 × 10^{8} |

7 | 4693.06 | 21,302.1 | 3s^{2}3p^{3} (^{2}D°)3d | ^{3}D° | 2 | 3s^{2}3p^{3} (^{4}S°) 4p | ^{3}P | 1 | 1.33 × 10^{7} | 4.83 × 10^{8} |

1 | 5587.80 | 17,891.2 | 3s^{2}3p^{3} (^{4}S°)4s | ^{3}S° | 1 | 3s^{2}3p^{3} (^{4}S°) 4p | ^{5}P | 1 | 4.62 × 10^{5} | |

9 | 5869.96 | 17,031.2 | 3s^{2}3p^{3} (^{2}P°)3d | ^{3}D° | 3 | 3s^{2}3p^{3} (^{2}D°) 4p | ^{1}F | 3 | 1.21 × 10^{6} | |

9 | 5976.62 | 16,727.2 | 3s^{2}3p^{3} (^{2}P°)3d | ^{1}D° | 2 | 3s^{2}3p^{3} (^{2}D°) 4p | ^{1}D | 2 | 3.59 × 10^{7} | |

9 | 6054.43 | 16,512.3 | 3s^{2}3p^{3} (^{2}D°) 4p | ^{1}D | 2 | 3s^{2}3p^{3} (^{4}S°) 5s | ^{3}S° | 1 | 4.23 × 10^{3} | |

7 | 6167.05 | 16,210.6 | 3s^{2}3p^{3} (^{2}D°) 4p | ^{1}D | 2 | 3s^{2}3p^{3} (^{4}S°) 4d | ^{3}D° | 1 | 3.17 × 10^{4} | |

8 | 6187.84 | 16,156.3 | 3s^{2}3p^{3} (^{2}D°)3d | ^{1}P° | 1 | 3s^{2}3p^{3} (^{2}D°)4p | ^{1}D | 2 | 1.14 × 10^{7} | |

3 | 6217.65 | 15,940.4 | 3s^{2}3p^{3} (^{2}D°) 3d | ^{3}D° | 3 | 3s^{2}3p^{3} (^{4}S) 4p | ^{5}P | 2 | 4.48 × 10^{4} |

* Double classification.

Rel. Int. | Observed Wavelength Vac (Å) | Wavenumber (cm^{−1}) σ_{obs} | Lower Level Conf. Term, J | Upper Level Conf. Term, J | gA (s^{−1}) | gA (s^{-1}) Reference [16] | ||||

1 | 480.61 | 208,068 | 3s3p^{4} | ^{4}P | ^{1}/_{2} | 3s^{2}3p^{2} (^{1}S) 4p | ^{2}P° | ^{1}/_{2} | 2.30 × 10^{4} | |

4 | 491.01 | 203,662 | 3s^{2}3p^{3} | ^{2}D° | ^{3}/_{2} | 3s^{2}3p^{2} (^{3}P) 3d | ^{2}D | ^{3}/_{2} | 5.87 × 10^{9} | |

3 | 499.48 | 200,208 | 3s^{2}3p^{3} | ^{2}D° | ^{3}/_{2} | 3s^{2}3p^{2} (^{3}P) 3d | ^{4}P | ^{3}/_{2} | 4.41 × 10^{7} | |

2 | 500.75 | 199,700 | 3s^{2}3p^{3} | ^{2}D° | ^{3}/_{2} | 3s^{2}3p^{2} (^{3}P) 3d | ^{4}P | ^{5}/_{2} | 1.97 × 10^{7} | |

5 | 501.09 | 199,565 | 3s^{2}3p^{3} | ^{2}D° | ^{5}/_{2} | 3s^{2}3p^{2} (^{3}P) 3d | ^{4}P | ^{5}/_{2} | 1.53 × 10^{8} | |

1 | 520.90 | 191,975 | 3s3p^{4} | ^{4}P | ^{1}/_{2} | 3s^{2}3p^{2} (^{1}D) 4p | ^{2}P° | ^{1}/_{2} | 5.91 × 10^{3} | |

7 | 536.08 | 186,539 | 3s^{2}3p^{3} | ^{2}D° | ^{5}/_{2} | 3s^{2}3p^{2} (^{1}D) 3d | ^{2}G | ^{7}/_{2} | 4.11 × 10^{7} | 2.48 × 10^{7} |

2 | 564.06 | 177,286 | 3s3p^{4} | ^{4}P | ^{3}/_{2} | 3s^{2}3p^{2} (^{3}P) 4p | ^{2}P° | ^{1}/_{2} | 5.73 × 10^{5} | |

3 | 596.65 | 167,602 | 3s^{2}3p^{3} | ^{2}D° | ^{3}/_{2} | 3s^{2}3p^{2} (^{3}P) 3d | ^{4}D | ^{1}/_{2} | 9.99 × 10^{6} | 6.18 × 10^{6} |

2 | 599.11 | 166,912 | 3s3p^{4} | ^{4}P | ^{1}/_{2} | 3s^{2}3p^{2} (^{3}P) 4p | ^{4}D° | ^{1}/_{2} | 3.00 × 10^{7} | 1.05 × 10^{7} |

3 | 604.76 | 165,355 | 3s3p^{4} | ^{2}D | ^{3}/_{2} | 3s^{2}3p^{2} (^{1}D) 4p | ^{2}P° | ^{3}/_{2} | 7.34 × 10^{8} | |

2 | 605.06 | 165,273 | 3s3p^{4} | ^{2}D | ^{5}/_{2} | 3s^{2}3p^{2} (^{1}D) 4p | ^{2}P° | ^{3}/_{2} | 8.37 × 10^{8} | |

2 | 627.10 | 159,464 | 3s^{2}3p^{3} | ^{2}D° | ^{5}/_{2} | 3s^{2}3p^{2} (^{3}P) 3d | ^{4}F | ^{3}/_{2} | 3.00 × 10^{5} | |

6 | 632.95 | 157,990 | 3s3p^{4} | ^{2}D | ^{5}/_{2} | 3s^{2}3p^{2} (^{1}D) 4p | ^{2}F° | ^{7}/_{2} | 3.95 × 10^{8} | |

2 | 686.52 | 145,662 | 3s3p^{4} | ^{2}D | ^{5}/_{2} | 3s^{2}3p^{2} (^{3}P) 4p | ^{2}D° | ^{5}/_{2} | 1.43 × 10^{6} | 6.31 × 10^{7} |

2 | 694.89 | 143,907 | 3s3p^{4} | ^{2}D | ^{3}/_{2} | 3s^{2}3p^{2} (^{3}P) 4p | ^{4}P° | ^{5}/_{2} | 1.05 × 10^{5} | |

2 | 695.27 | 143,830 | 3s^{2}3p^{2} (^{3}P)3d | ^{2}P | ^{1}/_{2} | 3s^{2}3p^{2} (^{1}D) 4p | ^{2}P° | ^{3}/_{2} | 6.60 × 10^{7} | |

2 | 698.33 | 143,199 | 3s3p^{4} | ^{2}D | ^{3}/_{2} | 3s^{2}3p^{2} (^{3}P) 4p | ^{4}P° | ^{1}/_{2} | 4.33 × 10^{5} | |

2 | 716.50 | 139,567 | 3s^{2}3p^{2} (^{3}P)3d | ^{4}D | ^{5}/_{2} | 3s^{2}3p^{2} (^{1}S) 4p | ^{2}P° | ^{3}/_{2} | 1.62 × 10^{4} | |

7 | 773.31 | 129,314 | 3s^{2}3p^{2} (^{3}P)3d | ^{2}P | ^{3}/_{2} | 3s^{2}3p^{2} (^{3}P) 4p | ^{2}P° | ^{1}/_{2} | 2.53 × 10^{8} | 3.82 × 10^{8} |

8 | 779.07 | 128,358 | 3s^{2}3p^{2} (^{3}P)3d | ^{2}P | ^{1}/_{2} | 3s^{2}3p^{2} (^{3}P) 4p | ^{2}P° | ^{3}/_{2} | 2.96 × 10^{8} | 4.56 × 10^{8} |

1 | 806.55 | 123,985 | 3s^{2}3p^{2} (^{3}P)3d | ^{4}D | ^{1}/_{2} | 3s^{2}3p^{2} (^{1}D) 4p | ^{2}P° | ^{3}/_{2} | 6.66 × 10^{5} | |

7 | 844.39 | 118,429 | 3s^{2}3p^{2} (^{3}P)3d | ^{4}D | ^{3}/_{2} | 3s^{2}3p^{2} (^{1}D) 4p | ^{2}D^{o} | ^{5}/_{2} | 2.74 × 10^{6} | |

3 | 847.68 | 117,969 | 3s3p^{4} | ^{2}S | ^{1}/_{2} | 3s^{2}3p^{2} (^{3}P) 4p | ^{2}P° | ^{3}/_{2} | 1.78 × 10^{6} | 1.98 × 10^{7} |

1 | 848.39 | 117,870 | 3s^{2}3p^{2} (^{1}D) 3d | ^{2}F | ^{5}/_{2} | 3s^{2}3p^{2} (^{1}D) 4p | ^{2}F° | ^{5}/_{2} | 1.01 × 10^{9} | |

2 | 850.80 | 117,537 | 3s^{2}3p^{2} (^{1}D) 3d | ^{2}F | ^{7}/_{2} | 3s^{2}3p^{2} (^{1}D) 4p | ^{2}F° | ^{7}/_{2} | 1.20 × 10^{9} | |

2 | 853.14 | 117,214 | 3s^{2}3p^{2} (^{1}D) 3d | ^{2}F | ^{7}/_{2} | 3s^{2}3p^{2} (^{1}D) 4p | ^{2}F° | ^{5}/_{2} | 1.17 × 10^{8} | |

3 | 859.34 | 116,368 | 3s^{2}3p^{2} (^{3}P) 3d | ^{2}P | ^{3}/_{2} | 3s^{2}3p^{2} (^{3}P) 4p | ^{2}S° | ^{1}/_{2} | 1.04 × 10^{9} | 1.21 × 10^{9} |

3 | 860.82 | 116,168 | 3s^{2}3p^{2} (^{3}P) 3d | ^{4}D | ^{5}/_{2} | 3s^{2}3p^{2} (^{1}D) 4p | ^{2}F° | ^{7}/_{2} | 6.59 × 10^{6} | |

3 | 863.24 | 115,843 | 3s^{2}3p^{2} (^{3}P) 3d | ^{4}D | ^{5}/_{2} | 3s^{2}3p^{2} (^{1}D) 4p | ^{2}F° | ^{5}/_{2} | 5.20 × 10^{7} | |

1 | 903.25 | 110,711 | 3s^{2}3p^{2} (^{3}P) 3d | ^{4}F | ^{5}/_{2} | 3s^{2}3p^{2} (^{3}P) 4p | ^{4}S° | ^{3}/_{2} | 3.94 × 10^{4} | |

9 | 922.68 | 108,380 | 3s^{2}3p^{2} (^{3}P) 3d | ^{4}D | ^{1}/_{2} | 3s^{2}3p^{2} (^{3}P) 4p | ^{2}P° | ^{1}/_{2} | 3.80 × 10^{6} | |

2 | 945.05 | 105,814 | 3s^{2}3p^{2} (^{3}P) 3d | ^{4}P | ^{3}/_{2} | 3s^{2}3p^{2} (^{1}S) 4p | ^{2}P° | ^{1}/_{2} | 5.74 × 10^{5} | |

1 | 953.37 | 104,891 | 3s3p^{4} | ^{2}S | ^{1}/_{2} | 3s^{2}3p^{2} (^{3}P) 4p | ^{2}S° | ^{1}/_{2} | 2.79 × 10^{6} | |

1 | 957.32 | 104,457 | 3s^{2}3p^{2} (^{1}D) 3d | ^{2}F | ^{5}/_{2} | 3s^{2}3p^{2} (^{3}P) 4p | ^{2}D° | ^{3}/_{2} | 3.01 × 10^{9} | 2.53 × 10^{9} |

6 | 958.34 | 104,347 | 3s^{2}3p^{2} (^{3}P) 3d | ^{4}D | ^{3}/_{2} | 3s^{2}3p^{2} (^{3}P) 4p | ^{4}S° | ^{3}/_{2} | 2.57 × 10^{7} | 7.19 × 10^{7} |

6 | 959.10 | 104,264 | 3s^{2}3p^{2} (^{3}P) 3d | ^{4}D | ^{3}/_{2} | 3s^{2}3p^{2} (^{3}P) 4p | ^{2}D° | ^{5}/_{2} | 9.61 × 10^{6} | 2.01 × 10^{7} |

5 | 962.27 | 103,921 | 3s^{2}3p^{2} (^{3}P) 3d | ^{4}D | ^{5}/_{2} | 3s^{2}3p^{2} (^{3}P) 4p | ^{4}S° | ^{3}/_{2} | 4.76 × 10^{7} | 4.93 × 10^{7} |

2 | 982.76 | 101,754 | 3s^{2}3p^{2} (^{1}D) 3d | ^{2}F | ^{5}/_{2} | 3s^{2}3p^{2} (^{3}P) 4p | ^{4}D° | ^{7}/_{2} | 1.19 × 10^{7} | 8.94 × 10^{7} |

7 | 986.07 | 101,413 | 3s^{2}3p^{2} (^{3}P) 3d | ^{4}D | ^{5}/_{2} | 3s^{2}3p^{2} (^{3}P) 4p | ^{4}P° | ^{3}/_{2} | 2.15 × 10^{9} | 2.07 × 10^{9} |

1 | 987.70 | 101,245 | 3s^{2}3p^{2} (^{3}P) 3d | ^{2}D | ^{5}/_{2} | 3s^{2}3p^{2} (^{1}S) 4p | ^{2}P° | ^{3}/_{2} | 1.05 × 10^{9} | |

1 | 989.12 | 101,100 | 3s^{2}3p^{2} (^{1}D) 3d | ^{2}F | ^{7}/_{2} | 3s^{2}3p^{2} (^{3}P) 4p | ^{4}D° | ^{7}/_{2} | 4.13 × 10^{8} | 3.11 × 10^{8} |

2 | 990.57 | 100,952 | 3s^{2}3p^{2} (^{1}D) 3d | ^{2}F | ^{5}/_{2} | 3s^{2}3p^{2} (^{3}P) 4p | ^{4}D° | ^{5}/_{2} | 3.03 × 10^{7} | 2.48 × 10^{8} |

1 | 997.06 | 100,295 | 3s^{2}3p^{2} (^{1}D) 3d | ^{2}F | ^{7}/_{2} | 3s^{2}3p^{2} (^{3}P) 4p | ^{4}D° | ^{5}/_{2} | 8.36 × 10^{7} | 4.77 × 10^{7} |

2 | 1019.73 | 98,065 | 3s^{2}3p^{2} (^{1}D) 3d | ^{2}G | ^{7}/_{2} | 3s^{2}3p^{2} (^{1}D) 4p | ^{2}D^{o} | ^{5}/_{2} | 2.07 × 10^{7} | |

1 | 1114.60 | 89,718 | 3s^{2}3p^{2} (^{3}P) 3d | ^{4}P | ^{3}/_{2} | 3s^{2}3p^{2} (^{1}D) 4p | ^{2}P° | ^{1}/_{2} | 8.89 × 10^{5} | |

4 | 1118.70 | 89,390 | 3s^{2}3p^{2} (^{3}P) 3d | ^{4}P | ^{1}/_{2} | 3s^{2}3p^{2} (^{1}D) 4p | ^{2}P° | ^{1}/_{2} | 1.26 × 10^{5} | |

1 | 1127.19 | 88,716 | 3s^{2}3p^{2} (^{1}D) 3d | ^{2}D | ^{5}/_{2} | 3s^{2}3p^{2} (^{1}S) 4p | ^{2}P° | ^{3}/_{2} | 7.89 × 10^{7} | |

1 | 1132.00 | 88,339 | 3s^{2}3p^{2} (^{1}D) 3d | ^{2}D | ^{3}/_{2} | 3s^{2}3p^{2} (^{1}S) 4p | ^{2}P° | ^{3}/_{2} | 8.98 × 10^{6} | |

1 | 1135.56 | 88,062 | 3s3p^{4} | ^{2}P | ^{3}/_{2} | 3s^{2}3p^{2} (^{1}D) 4p | ^{2}P° | ^{1}/_{2} | 2.95 × 10^{7} | |

1 | 1135.56 | 88,062 | 3s^{2}3p^{2} (^{1}D) 3d | ^{2}D | ^{3}/_{2} | 3s^{2}3p^{2} (^{1}S) 4p | ^{2}P° | ^{1}/_{2} | 2.34 × 10^{7} | |

1 | 1146.02 | 87,259 | 3s3p^{4} | ^{2}P | ^{1}/_{2} | 3s^{2}3p^{2} (^{1}D) 4p | ^{2}P° | ^{3}/_{2} | 5.06 × 10^{7} | |

2 | 1217.88 | 82,115 | 3s^{2}3p^{2} (^{1}D) 3d | ^{2}P | ^{1}/_{2} | 3s^{2}3p^{2} (^{1}S) 4p | ^{2}P° | ^{3}/_{2} | 2.70 × 10^{7} | |

5 | 1218.52 | 82,067 | 3s^{2}3p^{2} (^{1}D) 3d | ^{2}G | ^{7}/_{2} | 3s^{2}3p^{2} (^{3}P) 4p | ^{4}P° | ^{5}/_{2} | 3.34 × 10^{5} | |

6 | 1232.37 | 81,145 | 3s^{2}3p^{2} (^{3}P) 3d | ^{2}D | ^{3}/_{2} | 3s^{2}3p^{2} (^{1}D) 4p | ^{2}D^{o} | ^{3}/_{2} | 1.23 × 10^{7} | |

5 | 1233.47 | 81,072 | 3s^{2}3p^{2} (^{3}P) 3d | ^{2}D | ^{3}/_{2} | 3s^{2}3p^{2} (^{1}D) 4p | ^{2}D^{o} | ^{5}/_{2} | 1.71 × 10^{7} | |

5 | 1254.87 | 79,690 | 3s^{2}3p^{2} (^{1}D) 3d | ^{2}G | ^{9}/_{2} | 3s^{2}3p^{2} (^{3}P) 4p | ^{4}D° | ^{7}/_{2} | 2.68 × 10^{5} | |

7 | 1254.97 | 79,683 | 3s^{2}3p^{2} (^{3}P) 3d | ^{2}D | ^{5}/_{2} | 3s^{2}3p^{2} (^{1}D) 4p | ^{2}D^{o} | ^{5}/_{2} | 4.47 × 10^{7} | |

4 | 1307.41 | 76,487 | 3s^{2}3p^{2} (^{3}P)4s | ^{4}P | ^{3}/_{2} | 3s^{2}3p^{2} (^{1}S) 4p | ^{2}P° | ^{3}/_{2} | 1.05 × 10^{5} | |

2 | 1312.11 | 76,213 | 3s^{2}3p^{2} (^{3}P)4s | ^{4}P | ^{3}/_{2} | 3s^{2}3p^{2} (^{1}S) 4p | ^{2}P° | ^{1}/_{2} | 1.00 × 10^{5} | |

1 | 1333.06 | 75,015 | 3s^{2}3p^{2} (^{3}P) 3d | ^{4}P | ^{5}/_{2} | 3s^{2}3p^{2} (^{3}P) 4p | ^{2}P° | ^{3}/_{2} | 4.31 × 10^{6} | |

7 | 1372.75 | 72,847 | 3s3p^{4} | ^{2}P | ^{3}/_{2} | 3s^{2}3p^{2} (^{3}P) 4p | ^{2}P° | ^{3}/_{2} | 8.47 × 10^{7} | 3.83 × 10^{7} |

1 | 1377.35 | 72,603 | 3s^{2}3p^{2} (^{1}D) 3d | ^{2}D | ^{5}/_{2} | 3s^{2}3p^{2} (^{1}D) 4p | ^{2}P° | ^{3}/_{2} | 3.15 × 10^{8} | |

2 | 1407.94 | 71,026 | 3s^{2}3p^{2}(^{3}P) 4s | ^{2}P | ^{1}/_{2} | 3s^{2}3p^{2} (^{1}S) 4p | ^{2}P° | ^{1}/_{2} | 2.21 × 10^{7} | |

8 | 1410.89 | 70,877 | 3s^{2}3p^{2} (^{3}P) 3d | ^{4}P | ^{5}/_{2} | 3s^{2}3p^{2} (^{3}P) 4p | ^{2}D° | ^{5}/_{2} | 3.09 × 10^{7} | 3.61 × 10^{7} |

7 | 1421.24 | 70,361 | 3s^{2}3p^{2} (^{3}P) 3d | ^{4}P | ^{3}/_{2} | 3s^{2}3p^{2} (^{3}P) 4p | ^{2}D° | ^{5}/_{2} | 1.62 × 10^{7} | 2.10 × 10^{7} |

1 | 1433.28 | 69,770 | 3s^{2}3p^{2} (^{3}P) 4s | ^{2}P | ^{3}/_{2} | 3s^{2}3p^{2} (^{1}S) 4p | ^{2}P° | ^{1}/_{2} | 1.26 × 10^{7} | |

4 | 1439.58 | 69,465 | 3s^{2}3p^{2} (^{3}P) 3d | ^{4}P | ^{5}/_{2} | 3s^{2}3p^{2} (^{3}P) 4p | ^{2}D° | ^{3}/_{2} | 1.20 × 10^{7} | 2.83 × 10^{7} |

2 | 1453.74 | 68,788 | 3s3p^{4} | ^{2}P | ^{3}/_{2} | 3s^{2}3p^{2} (^{3}P) 4p | ^{4}S° | ^{3}/_{2} | 7.27 × 10^{6} | 1.88 × 10^{7} |

7 | 1487.51 | 67,226 | 3s^{2}3p^{2} (^{1}D) 3d | ^{2}D | ^{5}/_{2} | 3s^{2}3p^{2} (^{1}D) 4p | ^{2}D^{o} | ^{3}/_{2} | 5.18 × 10^{7} | |

5 | 1489.10 | 67,155 | 3s^{2}3p^{2} (^{1}D) 3d | ^{2}D | ^{5}/_{2} | 3s^{2}3p^{2} (^{1}D) 4p | ^{2}D^{o} | ^{5}/_{2} | 1.19 × 10^{9} | |

3 | 1494.59 | 66,908 | 3s^{2}3p^{2} (^{3}P) 3d | ^{2}D | ^{3}/_{2} | 3s^{2}3p^{2} (^{3}P) 4p | ^{2}D° | ^{5}/_{2} | 2.47 × 10^{7} | |

7 | 1497.60 | 66,774 | 3s^{2}3p^{2} (^{1}D) 3d | ^{2}D | ^{3}/_{2} | 3s^{2}3p^{2} (^{1}D) 4p | ^{2}D^{o} | ^{5}/_{2} | 1.04 × 10^{8} | |

2 | 1512.87 | 66,101 | 3s^{2}3p^{2} (^{1}D) 3d | ^{2}P | ^{1}/_{2} | 3s^{2}3p^{2} (^{1}D) 4p | ^{2}P° | ^{3}/_{2} | 2.96 × 10^{7} | |

2 | 1538.63 | 64,993 | 3s^{2}3p^{2} (^{1}D) 3d | ^{2}D | ^{5}/_{2} | 3s^{2}3p^{2} (^{1}D) 4p | ^{2}F° | ^{5}/_{2} | 1.58 × 10^{7} | |

1 | 1636.69 | 61,099 | 3s^{2}3p^{2} (^{3}P) 3d | ^{4}P | ^{1}/_{2} | 3s^{2}3p^{2} (^{3}P) 4p | ^{2}S° | ^{1}/_{2} | 2.48 × 10^{3} | 8.40 × 10^{6} |

1 | 1646.84 | 60,722 | 3s^{2}3p^{2} (^{1}D) 3d | ^{2}P | ^{1}/_{2} | 3s^{2}3p^{2} (^{1}D) 4p | ^{2}D° | ^{3}/_{2} | 2.32 × 10^{7} | |

1 | 1795.85 | 55,684 | 3s^{2}3p^{2} (^{3}P) 4s | ^{4}P | ^{1}/_{2} | 3s^{2}3p^{2} (^{1}D) 4p | ^{2}D^{o} | ^{3}/_{2} | 1.11 × 10^{7} | |

2 | 1887.01 | 52,992 | 3s^{2}3p^{2} (^{1}D) 3d | ^{2}D | ^{5}/_{2} | 3s^{2}3p^{2} (^{3}P) 4p | ^{2}D° | ^{5}/_{2} | 7.60 × 10^{7} | 3.22 × 10^{7} |

1 | 1953.12 | 51,200 | 3s^{2}3p^{2} (^{1}D) 3d | ^{2}D | ^{3}/_{2} | 3s^{2}3p^{2} (^{3}P) 4p | ^{2}D° | ^{3}/_{2} | 4.88 × 10^{7} | 2.45 × 10^{7} |

1 | 1975.10 | 50,630 | 3s^{2}3p^{2} (^{1}D) 3d | ^{2}P | ^{1}/_{2} | 3s^{2}3p^{2} (^{3}P) 4p | ^{2}P° | ^{3}/_{2} | 1.18 × 10^{7} | 1.29 × 10^{7} |

2 | 1980.41 | 50,495 | 3s^{2}3p^{2} (^{1}D) 3d | ^{2}P | ^{1}/_{2} | 3s^{2}3p^{2} (^{3}P) 4p | ^{2}P° | ^{1}/_{2} | 1.51 × 10^{6} | 1.83 × 10^{6} |

Observed Wavelength Air (Å) | ||||||||||

3 | 2311.05 | 43,257.1 | 3s^{2}3p^{2}(^{1}D) 4s | ^{2}D | ^{3}/_{2} | 3s^{2}3p^{2} (^{1}D) 4p | ^{2}P° | ^{1}/_{2} | 8.16 × 10^{8} | |

1 | 2319.82 | 43,093.6 | 3s^{2}3p^{2} (^{3}P) 3d | ^{2}F | ^{7}/_{2} | 3s^{2}3p^{2} (^{3}P) 4p | ^{4}P° | ^{5}/_{2} | 2.00 × 10^{7} | |

6 | 2385.63 | 41,904.1 | 3s^{2}3p^{2} (^{1}S) 3d | ^{2}D | ^{5}/_{2} | 3s^{2}3p^{2} (^{1}D) 4p | ^{2}F° | ^{5}/_{2} | 4.40 × 10^{6} | |

1 | 2435.91 | 41,040.0 | 3s^{2}3p^{2} (^{1}S) 3d | ^{2}D | ^{3}/_{2} | 3s^{2}3p^{2} (^{1}D) 4p | ^{2}F° | ^{5}/_{2} | 3.48 × 10^{7} | |

4 | 2451.42 | 40,780.3 | 3s^{2}3p^{2} (^{1}D) 3d | ^{2}P | ^{1}/_{2} | 3s^{2}3p^{2} (^{3}P) 4p | ^{4}D° | ^{1}/_{2} | 9.44 × 10^{3} | |

3 | 2906.13 | 34,400.0 | 3s^{2}3p^{2} (^{3}P) 4s | ^{2}P | ^{3}/_{2} | 3s^{2}3p^{2} (^{3}P) 4p | ^{4}S° | ^{3}/_{2} | 4.97 × 10^{5} | |

4 | 2936.85 | 34,040.1 | 3s^{2}3p^{2} (^{1}S) 3d | ^{2}D | ^{5}/_{2} | 3s^{2}3p^{2} (^{3}P) 4p | ^{2}P° | ^{3}/_{2} | 7.71 × 10^{7} | 6.40 × 10^{8} |

3 | 3013.45 | 33,174.9 | 3s^{2}3p^{2} (^{1}S) 3d | ^{2}D | ^{3}/_{2} | 3s^{2}3p^{2} (^{3}P) 4p | ^{2}P° | ^{3}/_{2} | 8.83 × 10^{6} | 9.85 × 10^{7} |

8 | 3025.44 | 33,043.4 | 3s^{2}3p^{2} (^{1}S) 3d | ^{2}D | ^{3}/_{2} | 3s^{2}3p^{2} (^{3}P) 4p | ^{2}P° | ^{1}/_{2} | 3.77 × 10^{7} | 3.57 × 10^{8} |

2 | 3074.86 | 32,512.4 | 3s^{2}3p^{2} (^{3}P) 4s | ^{4}P | ^{1}/_{2} | 3s^{2}3p^{2} (^{3}P) 4p | ^{2}S° | ^{1}/_{2} | 3.05 × 10^{6} | |

3 | 3141.25 | 31,825.2 | 3s^{2}3p^{2} (^{3}P) 4s | ^{4}P | ^{3}/_{2} | 3s^{2}3p^{2} (^{3}P) 4p | ^{2}S° | ^{1}/_{2} | 5.81 × 10^{6} | 4.22 × 10^{6} |

4 | 3143.89 | 31,778.3 | 3s^{2}3p^{2} (^{3}P) 4s | ^{2}P | ^{3}/_{2} | 3s^{2}3p^{2} (^{3}P) 4p | ^{4}P° | ^{1}/_{2} | 4.74 × 10^{6} | |

1 | 3317.29 | 30,136.4 | 3s^{2}3p^{2} (^{3}P) 4s | ^{2}P | ^{1}/_{2} | 3s^{2}3p^{2} (^{3}P) 4p | ^{4}D° | ^{3}/_{2} | 1.02 × 10^{6} | |

4 | 3399.88 | 29,404.4 | 3s^{2}3p^{2} (^{3}P) 4s | ^{2}P | ^{3}/_{2} | 3s^{2}3p^{2} (^{3}P) 4p | ^{4}D° | ^{5}/_{2} | 1.83 × 10^{6} | |

2 | 3561.57 | 28,069.5 | 3s^{2}3p^{2} (^{1}S) 3d | ^{2}D | ^{5}/_{2} | 3s^{2}3p^{2} (^{3}P) 4p | ^{4}P° | ^{5}/_{2} | 1.33 × 10^{6} | |

4 | 3618.61 | 27,627.0 | 3s^{2}3p^{2} (^{1}S) 3d | ^{2}D | ^{3}/_{2} | 3s^{2}3p^{2} (^{3}P) 4p | ^{2}D° | ^{3}/_{2} | 1.23 × 10^{7} | 6.96 × 10^{7} |

1 | 3639.09 | 27,471.6 | 3s^{2}3p^{2} (^{1}S) 3d | ^{2}D | ^{5}/_{2} | 3s^{2}3p^{2} (^{3}P) 4p | ^{4}P° | ^{3}/_{2} | 1.29 × 10^{5} | |

2 | 3674.93 | 27,203.7 | 3s^{2}3p^{2} (^{1}S) 3d | ^{2}D | ^{3}/_{2} | 3s^{2}3p^{2} (^{3}P) 4p | ^{4}P° | ^{5}/_{2} | 5.55 × 10^{4} | |

1 | 3752.79 | 26,639.2 | 3s^{2}3p^{2} (^{3}P) 4s | ^{2}P | ^{1}/_{2} | 3s^{2}3p^{2} (^{3}P) 4p | ^{2}S° | ^{1}/_{2} | 1.07 × 10^{8} | 6.94 × 10^{7} |

2 | 4000.64 | 24,988.9 | 3s^{2}3p^{2} (^{1}S) 3d | ^{2}D | ^{5}/_{2} | 3s^{2}3p^{2} (^{3}P) 4p | ^{4}D° | ^{5}/_{2} | 1.73 × 10^{3} | |

9 | 4168.14 | 23,984.8 | 3s^{2}3p^{2}(^{1}D) 4s | ^{2}D | ^{3}/_{2} | 3s^{2}3p^{2} (^{3}P) 4p | ^{4}S° | ^{3}/_{2} | 7.90 × 10^{2} | |

8 | 4178.81 | 23,923.5 | 3s^{2}3p^{2}(^{1}D) 4s | ^{2}D | ^{5}/_{2} | 3s^{2}3p^{2} (^{3}P) 4p | ^{2}D° | ^{5}/_{2} | 9.64 × 10^{7} | 8.11 × 10^{7} |

6 | 4182.41 | 23,902.9 | 3s^{2}3p^{2}(^{1}D) 4s | ^{2}D | ^{3}/_{2} | 3s^{2}3p^{2} (^{3}P) 4p | ^{2}D° | ^{5}/_{2} | 1.01 × 10^{8} | |

6 | 4044.85 | 22,511.9 | 3s^{2}3p^{2}(^{1}D) 4s | ^{2}D | ^{5}/_{2} | 3s^{2}3p^{2} (^{3}P) 4p | ^{2}D° | ^{3}/_{2} | 6.02 × 10^{6} | |

3 | 4285.01 | 23,330.6 | 3s^{2}3p^{2} (^{1}S) 3d | ^{2}D | ^{3}/_{2} | 3s^{2}3p^{2} (^{3}P) 4p | ^{4}D° | ^{1}/_{2} | 1.19 × 10^{4} | |

8 | 4444.96 | 22,491.1 | 3s^{2}3p^{2} (^{1}D) 4s | ^{2}D | ^{3}/_{2} | 3s^{2}3p^{2} (^{3}P) 4p | ^{2}D° | ^{3}/_{2} | 4.58 × 10^{7} | 3.85 × 10^{7} |

6 | 4525.46 | 22,091.0 | 3s^{2}3p^{2} (^{1}D) 4s | ^{2}D | ^{5}/_{2} | 3s^{2}3p^{2} (^{3}P) 4p | ^{4}P° | ^{5}/_{2} | 3.52 × 10^{6} | |

3 | 4529.64 | 22,070.6 | 3s^{2}3p^{2} (^{1}D) 4s | ^{2}D | ^{3}/_{2} | 3s^{2}3p^{2} (^{3}P) 4p | ^{4}P° | ^{5}/_{2} | 4.37 × 10^{5} | |

4 | 4655.59 | 21,473.5 | 3s^{2}3p^{2} (^{1}D) 4s | ^{2}D | ^{3}/_{2} | 3s^{2}3p^{2} (^{3}P) 4p | ^{4}P° | ^{3}/_{2} | 7.00 × 10^{5} | |

2 | 4680.08 | 21,361.2 | 3s^{2}3p^{2} (^{1}D) 4s | ^{2}D | ^{3}/_{2} | 3s^{2}3p^{2} (^{3}P) 4p | ^{4}P° | ½ | 5.39 × 10^{3} |

* Double classification.

**Table 5.**Energy parameters (cm

^{−1}) for the studied even parity configurations of Ar III. HF, Hartree–Fock.

Configuration | Parameter | HF Value | Fitted Value | Fitt/HF ^{a} |

3s^{2}3p^{4} | E_{av} | 22,421 ± 52 | ||

F^{2} (3p, 3p) | 68,558 | 57,745 ± 203 | 0.84 | |

α | 69 (FIX) | |||

ζ_{3p} | 1005 | 1096 ± 98 | 1.09 | |

3s^{2}3p^{3}4p | E_{av} | 219,988 | 227,971 ± 20 | 1.04 |

F^{2} (3p, 3p) | 72,040 | 56,805 ± 117 | 0.79 | |

α | 100 (FIX) | |||

ζ_{3p} | 1114 | 1659 ± 142 | 1.49 | |

ζ_{4p} | 150 | 143 (FIX) | 0.95 | |

F^{2} (3p, 4p) | 14,694 | 14,240 ± 214 | 0.97 | |

G^{0} (3p, 4p) | 3979 | 3343 ± 22 | 0.84 | |

G^{2} (3p, 4p) | 4556 | 3441 ± 118 | 0.75 | |

Configuration Interaction (CI) Integrals | ||||

3s^{2}3p^{4}–3s3p^{4}3d | R^{1} (3s3p, 3p3d) | 80,053 | 72,047 (FIX) | 0.90 |

3s^{2}3p^{4}–3s3p^{4}3d | R^{1} (3s3p, 3d 3p) | 59,375 | 50,469 (FIX) | 0.85 |

3s^{2}3p^{4}–3p^{6} | R^{1} (3s3s, 3p3p) | 94,238 | 65,967 (FIX) | 0.70 |

^{a}Parameters omitted from this table: direct and exchange integrals and spin-orbit ζ parameters set to 85% and 95% of their HF values, respectively; CI integrals were set to 85% of their HF values. The standard deviation for the energy adjustment was 101 cm

^{−1}.

Configuration | Parameter | HF Value | Fitted Value | Fitt/HF ^{a} |

3s3p^{5} | E_{av} | 147,157 | 150,084 ± 398 | 1.02 |

ζ_{3p} | 1008 | 1008 ± 399 | 1.00 | |

G^{1} (3s, 3p) | 94,422 | 77,710 ± 2155 | 0.82 | |

3s^{2}3p^{3}3d | E_{av} | 173,498 | 181,366 ± 145 | 1.04 |

F^{2} (3p, 3p) | 69,680 | 54,348 ± 481 | 0.78 | |

α | 248 (FIX) | |||

ζ_{3p} | 1046 | 1176 ± 207 | 1.12 | |

ζ_{3d} | 25 | 24 (FIX) | 0.95 | |

F^{2} (3p, 3d) | 54,654 | 49,263 ± 597 | 0.90 | |

G^{1} (3p, 3d) | 68,216 | 57,194 ± 626 | 0.84 | |

G^{2} (3p, 3d) | 5394 ± 463 | |||

G^{3} (3p, 3d) | 40,866 | 32,109 ± 601 | 0.78 | |

3s^{2}3p^{3}4s | E_{av} | 189,895 | 197,135 ± 122 | 1.04 |

F^{2} (3p, 3p) | 71,619 | 54,250 ± 561 | 0.76 | |

α | 240 (FIX) | |||

ζ_{3p} | 1104 | 1049 (FIX) | 0.95 | |

G^{1} (3p, 4s) | 5735 | 4923 ± 284 | 0.86 | |

3s^{2}3p^{3}4d | E_{av} | 261,115 | 268,449 ± 122 | 1.03 |

F^{2} (3p, 3p) | 71,954 | 57,693 ± 483 | 0.80 | |

α | 119 (FIX) | |||

ζ_{3p} | 1109 | 1949 ± 415 | 1.76 | |

ζ_{4d} | 6 | 6 (FIX) | 1.00 | |

F^{2} (3p, 4d) | 11,486 | 10,068 ± 1375 | 0.88 | |

G^{1} (3p, 4d) | 8905 | 7143 ± 601 | 0.80 | |

G^{3} (3p, 4d) | 5982 | 5085 (FIX) | 0.85 | |

3s^{2}3p^{3}5s | E_{av} | 264,555 | 272,420 ± 114 | 1.03 |

F^{2} (3p, 3p) | 72,136 | 57,347 ± 631 | 0.79 | |

α | 86 (FIX) | |||

ζ_{3p} | 1117 | 1299 ± 297 | 1.16 | |

G^{1} (3p, 5s) | 1714 | 1467 ± 299 | 0.85 | |

Configuration Interaction Integrals | ||||

3s3p^{5}–3s^{2}3p^{3}3d | R^{1} (3p3p, 3s3d) | 78,625 | 61,091 ± 605 | 0.78 |

3s^{2}3p^{3}3d–3s^{2}3p^{3}4d | R^{2} (3p3d, 3p4d) | 16,765 | 12,132 ± 1046 | 0.72 |

3s^{2}3p^{3}3d–3s^{2}3p^{3}4d | R^{1} (3p3d, 4d 3p) | 23,116 | 24,234 ± 1142 | 1.05 |

3s^{2}3p^{3}3d–3s^{2}3p^{3}4d | R^{3} (3p3d, 4d 3p) | 14,594 | 18,936 ± 2310 | 1.30 |

^{a}Parameters omitted from this table: direct and exchange integrals, and spin-orbit ζ parameters set to 85% and 95% of their HFR values, respectively; CI integrals were set to 85% of their HFR values. The standard deviation for the energy adjustment was 339 cm

^{−1}.

Configuration | Parameter | HF Value | Fitted Value | Fitt/HF ^{a} |

3s^{2}3p^{3} | E_{av} | 27,428± 135 | ||

F^{2} (3p, 3p) | 72,352 | 66,464 ± 775 | 0.92 | |

α | −281 (FIX) | |||

ζ_{3p} | 1123 | 1292 ± 253 | 1.15 | |

3s^{2}3p^{2}4p | E_{av} | 285,513 | 297,973 ± 64 | 1.04 |

F^{2} (3p, 3p) | 75,485 | 61,386 ± 380 | 0.81 | |

α | 74 (FIX) | |||

ζ_{3p} | 1235 | 1045 ± 194 | 0.85 | |

ζ_{4p} | 232 | 221(FIX) | 0.95 | |

F^{2} (3p, 4p) | 19,068 | 15940 ± 407 | 0.84 | |

G^{0} (3p, 4p) | 5396 | 4064 ± 91 | 0.75 | |

G^{2} (3p, 4p) | 6186 | 4272 ± 404 | 0.69 |

^{a}Parameters omitted from this table: direct and exchange integrals, and spin-orbit ζ parameters set to 85% and 95% of their HF values, respectively; CI integrals were set to 85% of their HF values. The standard deviation for the energy adjustment was 266 cm

^{−1}.

Configuration | Parameter | HF value | Fitted Value | Fitt/HF ^{a} |
---|---|---|---|---|

3s3p^{4} | E_{av} | 151,175 | 176,374 ± 134 | 1.17 |

F^{2} (3p, 3p) | 72,202 | 63,402 ± 574 | 0.88 | |

α | −490 (FIX) | |||

ζ_{3p} | 1124 | 1154 ± 262 | 1.03 | |

G^{1} (3s, 3p) | 98,569 | 87,487 ± 327 | 0.89 | |

3s^{2}3p^{2}3d | E_{av} | 196,615 | 220,619 ± 74 | 1.12 |

F^{2} (3p, 3p) | 73,023 | 75,396 ± 1781 | 1.03 | |

α | −774 (FIX) | |||

ζ_{3p} | 1153 | 1371 ± 148 | 1.19 | |

ζ_{3d} | 38 | 36 (FIX) | 0.95 | |

F^{2} (3p, 3d) | 63,295 | 54,769 ± 645 | 0.86 | |

G^{1} (3p, 3d) | 79,280 | 68,405 ± 234 | 0.86 | |

G^{3} (3p, 3d) | 48,285 | 30,970 ± 805 | 0.64 | |

3s^{2}3p^{2}4s | E_{av} | 248,237 | 260,502 ± 104 | 1.05 |

F^{2} (3p, 3p) | 75,073 | 60,250 ± 923 | 0.80 | |

α | 0 (FIX) | |||

ζ_{3p} | 1224 | 1299 ± 206 | 1.06 | |

G^{1} (3p, 4s) | 6979 | 5956 ± 226 | 0.85 |

^{a}Parameters omitted from this table: direct and exchange integrals, and spin-orbit ζ parameters set to 85% and 95% of their HF values, respectively; CI integrals were set to 85% of their HF values. The standard deviation for the energy adjustment was 242 cm

^{−1}.

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