Spectrum of Singly Charged Uranium (U II) : Theoretical Interpretation of Energy Levels, Partition Function and Classified Ultraviolet Lines
Laboratoire de Physique et Chimie Quantique, Université Mouloud Mammeri, BP 17 RP, 15000 Tizi-Ouzou, Algeria
LERMA, Observatoire de Paris, PSL Research University, CNRS, F-92195 Meudon, France
Laboratoire Aimé Cotton, CNRS UMR9188, Université Paris-Sud, ENS Cachan, Université Paris-Saclay, Bâtiment 505, F-91405 Orsay Cedex, France
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
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
are interpreted by 24 free parameters and 64 constrained ones, with a root mean square (rms
) deviation of 60 cm
. In the even parity, the four known configurations
and the unknown
form a basis for interpreting 125 levels with a rms
deviation of 84 cm
. Due to perturbations, the theoretical description of the higher configurations
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
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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.
Meftah A, Sabri M, Wyart J-F, Tchang-Brillet W-ÜL. Spectrum of Singly Charged Uranium (U II) : Theoretical Interpretation of Energy Levels, Partition Function and Classified Ultraviolet Lines. Atoms. 2017; 5(3):24.
Meftah, Ali; Sabri, Mourad; Wyart, Jean-François; Tchang-Brillet, Wan-Ü L. 2017. "Spectrum of Singly Charged Uranium (U II) : Theoretical Interpretation of Energy Levels, Partition Function and Classified Ultraviolet Lines." Atoms 5, no. 3: 24.
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