铥原子收敛于4f^(13)(~2F~?_(7/2))6s(7/2,1/2)~?_4和4f^(13)(~2F~?7/2)6s(7/2,1/2)~?_3偶宇称里德伯系列能级的电子关联效应

Electron correlation effects in even Rydberg series converging to 4f^(13)(~2F~?_(7/2))6s(7/2, 1/2)~?_4 and 4f^(13)(~2F~?7/2)6s(7/2, 1/2)~?_3 of thulium atom

本文在多通道量子亏损理论框架下,利用相对论多通道理论,计算了铥原子收敛于4f^(13)(~2F?_(7/2))6s(7/2,1/2)?_4和4f^(13)(~2F?7/2)6s(7/2,1/2)?_3的三个偶宇称里德伯系列.通过将计算结果与美国国家标准与技术研究院数据进行比较,展示了两种类型的电子关联效应:1)里德伯系列之间的相互作用,导致里德伯系列的能级出现整体偏移; 2)一个孤立的干扰态镶嵌在一个里德伯系列中,破坏了该里德伯系列能级的规则性.

In the frame work of multi-channel quantum defect theory（MQDT）, the energy levels of three even Rydberg series 4f^13（^2F°7/2）6s（7/2,1/2）°4和4f^13（^2F°7/2）6s（7/2,1/2）°3 converging to 4f^13（^2F°7/2）6s（7/2,1/2）°4和4f^13（^2F°7/2）6s（7/2,1/2）°3 of thulium atom are calculated by relativistic multi-channel theory. Compared with the experimental data from National Institute of Standards and Technology（NIST）, the theoretical result shows two different types of electron-correlation effects： 1） the interaction between two Rydberg series results in energy shifts for these Rydberg series; 2） an isolated perturbed state is embedded in the energy range of a Rydberg series and interacts with the whole series, and breaks the regularity of the Rydberg series, and quantum defects show a large jump around the perturbed state. More specifically, by comparing the present calculated quantum defects with the experimental data, we reassign two Rydberg series： 1） 4f^13（^2F°（7/2））6s（7/2, 1/2）°4np（3/2） Rydberg series from NIST is reassigned as 4f^13（^2F°（7/2））6s（7/2, 1/2）°4nf（5/2）, J^π=（5/2）＋, 4 f^13（^2F°（7/2））6s（7/2, 1/2）°4nf（5/2）, J^π=（7/2）^＋ and/or 4f^13（^2F°（7/2））6s（7/2, 1/2）°4np（1/2）, J^π=（9/2）^＋ Rydberg series, and the difference between experimental and calculated quantum defects is generally better than 0.1; 2） 4f^13（^2F°（7/2））6 s（7/2, 1/2）°3np（3/2） Rydberg series from NIST is reassigned as 4f^13（^2F°（7/2））6s（7/2, 1/2）°3nf（7/2）, J^π=（5/2）^＋, 4f^13（^2F°（7/2））6s（7/2, 1/2）°3nf（7/2）,J^π=（7/2）^＋ and/or 4f^13（^2F°（7/2））6s（7/2, 1/2）°3nf（5/2,7/2）, J^π=（9/2）^＋ Rydberg series, and the difference between experimental and calculated quantum defects is generally better than 0.05. As for the 4f^13（^2F°（7/2））6s（7/2, 1/2）°3np（1/2） Rydberg series from NIST, we find there is a perturbed state at about 49900 cm^-1, and assign the perturbed state as 4f^13（^3F4）6d5/26s^2, J = 7/2 and the total angular momentum for the Rydberg series is J = 7/2.