Spectrum of Singly Charged Uranium (U II) : Theoretical Interpretation of Energy Levels, Partition Function and Classified Ultraviolet Lines
Spectrum of Singly Charged Uranium (U II) : Theoretical Interpretation of Energy Levels, Partition Function and Classified Ultraviolet Lines
复制标题
DOI：
10.3390/atoms5030024
复制
发表时间：
2017-09-01
期刊：
影响因子：
1.8
通讯作者：
Tchang-Brillet, Wan-U Lydia
中科院分区：
文献类型：
--
作者：
Meftah, Ali;Sabri, Mourad;Tchang-Brillet, Wan-U Lydia
在试图改善U II分析，最低配置的奇偶校验已被解释的Rachah-Slater参数的方法，使用科万代码。在奇宇称中，包括基态，相互作用组态（5）f（3）7s（2）+（5）f（36）d 7s +5 f（3）6d（2）+5 f（4）7 p +5 f（5）的253个能级被24个自由参数和64个约束参数解释，均方根偏差为60 cm（-1）.在偶宇称中，四个已知的组态（5）f（4）7s，5 f（4）6d，5 f（2）6d（2）7s，5 f（2）6d 7s（2）和未知的5 f（2）6d（3）构成了解释125个水平的基础，均方根偏差为84 cm（-1）。由于微扰的存在，高组态5 f（3）7s 7 p +5 f（3）6d 7 p的理论描述仍然不能令人满意。已知的和预测的水平的U II用于确定的分配函数。参数研究使我们重新研究了80年代末默东天文台记录的铀的高分辨率紫外光谱，其中的分析是无法实现的。在本研究的过程中，在2344 - 2955埃的区域内，已经对451条U II线进行了分类。在39113.98 ± 0.1 cm（-1）处建立了一个新的能级：5 f（3）6d 7 p（（4）I）6 K（J = 5.5）。
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)7s(2) + (5)f(36)d7s +5f(3)6d(2) + 5f(4)7p + 5f(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)7s, 5f(4)6d, 5f(2)6d(2)7s, 5f(2)6d7s(2) and the unknown 5f(2)6d(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 5f(3)7s7p + 5f(3)6d7p 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 angstrom. One new level has been established as 5 f(3)6d7p ((4) I) 6K (J = 5.5) at 39113.98 +/- 0.1 cm(-1).