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Atoms 2016, 4(4), 31; doi:10.3390/atoms4040031

Spectrum and Energy Levels of Four-Times Ionized Yttrium (Y V)

National Institute of Standards and Technology, Gaithersburg, MD 20899-8422, USA
Academic Editor: James Babb
Received: 18 November 2016 / Accepted: 6 December 2016 / Published: 21 December 2016
(This article belongs to the Special Issue Spectra of Ionized Atoms: From Laboratory to Space)
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The analysis of the spectrum of four-times-ionized yttrium, Y V, was extended to provide a large number of new spectrum lines and energy levels. The new analysis is based on spectrograms made with sliding-spark discharges on 10.7 m normal- and grazing-incidence spectrographs. The measurements cover the region 184–2549 Å. The results revise levels for this spectrum by Zahid-Ali et al. (1975) and by Ateqad et al. (1984). Five hundred and seventy lines were classified as transitions between 23 odd-parity and 90 even-parity levels. The 4s24p5, 4s4p6, 4s24p44d, 5s, 5p, 5d, 6s configurations are now complete. Results for the 4s24p46d and 7s configurations are tentative. Ritz-type wavelengths were determined from the optimized energy levels, with uncertainties as low as ±0.0004 Å. The observed configurations were interpreted with Hartree-Fock calculations and least-squares fits of the energy parameters to the observed levels. Oscillator strengths for all classified lines were calculated with the fitted parameters. The results are compared with values for the level energies, percentage compositions, and transition probabilities from recent ab initio theoretical calculations. The ionization energy was revised to 607,760 ± 300 cm−1 (75.353 ± 0.037 eV). View Full-Text
Keywords: yttrium; ionic spectrum; vacuum ultraviolet; wavelengths; energy levels; transition probabilities; parametric calculations; ionization energy yttrium; ionic spectrum; vacuum ultraviolet; wavelengths; energy levels; transition probabilities; parametric calculations; ionization energy

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Reader, J. Spectrum and Energy Levels of Four-Times Ionized Yttrium (Y V). Atoms 2016, 4, 31.

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