文献类型：期刊文献

英文题名：Many-body calculation of helium ¹D-³D term intervals for 1snd (n=12～20) high Rydberg states

作者：He, Liming; Cao, Wei

机构：[1]E China Univ Sci & Technol, Dept Phys, Shanghai 200237, Peoples R China;[2]Univ Fribourg, Dept Phys, CH-1700 Fribourg, Switzerland

年份：2006

卷号：84

期号：12

起止页码：1097

外文期刊名：CANADIAN JOURNAL OF PHYSICS

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000246264200005)】；

语种：英文

摘要：With many-body perturbation theory, D-1-D-3 term intervals of helium 1snd (n = 12 similar to 20) configurations are calculated. Based on two different models, Rayleigh-Schrodinger perturbation expansion terms consisting of bound states only, and those of continua are evaluated, respectively. As for bound states, zeroth-order wave functions are strictly generated from self-iteration solutions of the Hartree equation and residues of infinite expansion series are dealt with by the integral processing method, while a simplified hydrogen potential is adopted to get the continua. Using Rayleigh-Schrodinger expansions, we evaluate exchange energy up to third-order terms. It is found that level splittings are mainly attributed to summations over bound states. The fine-structure level splittings yielded here are found to agree quite well with experimental results.