文献类型：期刊文献

英文题名：MBPT calculation for the fine-structure intervals of principal series np(n=3-9) for Na

作者：Chen Sun[1];Zhu Yun-Xia[1];Ge Zi-Ming[1];He Li-Ming[1]

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

年份：2012

卷号：61

期号：15

外文期刊名：ACTA PHYSICA SINICA

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000309089100021)】；

语种：英文

外文关键词：principal series; fine structure; many-body perturbation theory (MBPT); Breit effect

摘要：The fine-structure intervals of Na principal series np(n = 3-9) are calculated by the many-body perturbation theory (MBPT) within the framework of relativity. To deal with the problem that a large set of continuum states is required in the MBPT calculation, an exponential potential is employed to generate a discrete, finite and nearly complete set of numerical basis functions. The zeroth-order wavefunctions and eignvalues are obtained by solving the relativistic Hartree-Fock (RHF) equation and the RHF equation with the action of a potential barrier. The basis set used in this work contains intermediate orbitals with the angular momentum l <= 6 and in an appropriate energy range, and most of them are the so called "contracted" orbitals. Encouraging results are obtained using this technique to calculate the second-order correlation corrections, combining the Breit effects in a first-order perturbation approach. Compared with other theoretical calculations, the present results are much close to the experimental results.