文献类型：期刊文献

英文题名：Calculation of helium ¹D-³D term intervals for 1s nd (n=4-11) states

作者：He, LM; Cao, W; Chen, XQ; Zhu, YX

机构：[1]E China Univ Chem Technol, Dept Phys, Shanghai 200237, Peoples R China

年份：2005

卷号：54

期号：11

起止页码：5077

外文期刊名：ACTA PHYSICA SINICA

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000233221800017)】；

语种：英文

外文关键词：helium; Rydberg state; many-body perturbation theory (MBPT); configuration wave function; term interval

摘要：With many-body perturbation theory (MBPT), D-1-D-3 term intervals of helium 1 s n d (n = 4-11) configurations have been calculated. Based on two different models, Rayleigh-Schrodinger perturbation expansion terms only consisting of bound states and those of continua are calculated respectively. For bound states, the zeroth-order wave functions are strictly generated from self-iteration solutions of Hartree equation and residues of infinite perturbation series are dealt with by integral processing method. For continuum parts, a simplified hydrogen potential model is adopted. According to Rayleigh-Schrodinger expansion, the perturbation corrections to Rydberg states have been evaluated up to the third-order terms. From the calculation, the energy splittings are mainly attributed to bound parts. Singlet-triplet level splittings yielded here are found to agree quite well with two sets of experimental results.