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Atoms 2017, 5(3), 24; doi:10.3390/atoms5030024

Spectrum of Singly Charged Uranium (U II) : Theoretical Interpretation of Energy Levels, Partition Function and Classified Ultraviolet Lines

1
Laboratoire de Physique et Chimie Quantique, Université Mouloud Mammeri, BP 17 RP, 15000 Tizi-Ouzou, Algeria
2
LERMA, Observatoire de Paris, PSL Research University, CNRS, F-92195 Meudon, France
3
Laboratoire Aimé Cotton, CNRS UMR9188, Université Paris-Sud, ENS Cachan, Université Paris-Saclay, Bâtiment 505, F-91405 Orsay Cedex, France
4
Sorbonne Université, UPMC Université Paris 06, LERMA, F-75005 Paris, France
*
Author to whom correspondence should be addressed.
Academic Editor: Joseph Reader
Received: 23 March 2017 / Revised: 8 June 2017 / Accepted: 16 June 2017 / Published: 26 June 2017
(This article belongs to the Special Issue Spectra of Ionized Atoms: From Laboratory to Space)
View Full-Text   |   Download PDF [1035 KB, uploaded 28 June 2017]   |  

Abstract

In an attempt to improve U II analysis, the lowest configurations of both parities have been interpreted by means of the Racah-Slater parametric method, using Cowan codes. In the odd parity, including the ground state, 253 levels of the interacting configurations 5 f 3 7 s 2 + 5 f 3 6 d 7 s + 5 f 3 6 d 2 + 5 f 4 7 p + 5 f 5 are interpreted by 24 free parameters and 64 constrained ones, with a root mean square (rms) deviation of 60 cm 1 . In the even parity, the four known configurations 5 f 4 7 s , 5 f 4 6 d , 5 f 2 6 d 2 7 s , 5 f 2 6 d 7 s 2 and the unknown 5 f 2 6 d 3 form a basis for interpreting 125 levels with a rms deviation of 84 cm 1 . Due to perturbations, the theoretical description of the higher configurations 5 f 3 7 s 7 p + 5 f 3 6 d 7 p remains unsatisfactory. The known and predicted levels of U II are used for a determination of the partition function. The parametric study led us to a re-investigation of high resolution ultraviolet spectrum of uranium recorded at the Meudon Observatory in the late eighties, of which the analysis was unachieved. In the course of the present study, a number of 451 lines of U II has been classified in the region 2344 –2955 Å. One new level has been established as 5 f 3 6 d 7 p ( 4 I ) 6 K ( J = 5.5 ) at 39113.98 ± 0.1 cm 1 . View Full-Text
Keywords: uranium; actinide ions; emission spectrum; energy levels; energy parameters; partition function uranium; actinide ions; emission spectrum; energy levels; energy parameters; partition function
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MDPI and ACS Style

Meftah, A.; Sabri, M.; Wyart, J.-F.; Tchang-Brillet, W.-Ü.L. Spectrum of Singly Charged Uranium (U II) : Theoretical Interpretation of Energy Levels, Partition Function and Classified Ultraviolet Lines. Atoms 2017, 5, 24.

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