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碱金属原子光电离截面的计算
引用本文:芦鹏飞,杨向东,周晓林,刘锦超.碱金属原子光电离截面的计算[J].四川大学学报(自然科学版),2002,39(4):692-696.
作者姓名:芦鹏飞  杨向东  周晓林  刘锦超
作者单位:四川大学原子分子物理所,成都,610065
基金项目:国家自然科学基金 (19974 0 2 8),高等学校博士点专项科研基金 (1990 6 10 15 )
摘    要:作者用多体微扰理论(MBPT),对开壳层钠和钾原子的最外满壳层单光子电离过程进行了研究和理论计算。利用多体微扰理论的Goldstone图示法,对主要的电子关联作用进行了分析,给出了完整的从零级到二极的图示,其中二级近似包括了The random-phase approximation(RPA)及重要的Brueckner-orbital(BO)和Structure-radiation(SR)关联。考虑了分波截面在不同近似级下的变化。给出了截面的长度形式和速度形式,这两种形式符合较好,而且总截面与实验值亦符合较好。

关 键 词:光电离截面  计算  碱金属原子  多体微扰理论  原子物理学  Gddstone图示法  电子关联作用
文章编号:0490-6756(2002)04-0692-05

Photoionization Calculations for the Outermost Closed Shell of Alkali Metal Atoms
LU Peng fei,YANG Xiang dong,ZHOU Xiao lin,LIU Jin chao.Photoionization Calculations for the Outermost Closed Shell of Alkali Metal Atoms[J].Journal of Sichuan University (Natural Science Edition),2002,39(4):692-696.
Authors:LU Peng fei  YANG Xiang dong  ZHOU Xiao lin  LIU Jin chao
Abstract:The single photoionization of the outermost fully occupied shell in Na,K is studied within the framework of many body perturbation theory. The main electron correlation is analyzed and the diagrams from zero order to second order were given. It is showed that RPA,BO and SR correlation are dominant in the second order correlations which are present in Goldstone diagram. The length and velocity forms and the improvement for the partial cross sections within different correlations were given. The results are compared with measurements and theoretical calculations.
Keywords:alkali mstal atoms  many  body perturbation theory  photoionization  
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