相对论扭曲波方法研究电子与原子碰撞激发过程  

Fully relativistic distorted-wave method of studying electron-atom collision excitation process

作　　者：李文博 李兵兵 陈浩 颉录有 武中文 丁晓彬 张登红 蒋军 董晨钟 LI Wenbo;LI Bingbing;CHEN Hao;XIE Luyou;WU Zhongwen;DING Xiaobin;ZHANG Denghong;JIANG Jun;DONG Chenzhong(Key Laboratory of Atomic and Molecular Physics&Functional Materials of Gansu Province,College of Physics and Electronic Engineering,Northwest Normal University,Lanzhou 730070 China)

机构地区：[1]西北师范大学物理与电子工程学院,甘肃省原子分子物理与功能材料重点实验室,兰州730070

出　　处：《物理学报》2025年第3期27-39,共13页Acta Physica Sinica

基　　金：国家重点研发计划(批准号:2022YFA1602500);国家自然科学基金(批准号:12064041,12174315,12274352,12364034,12174316,12374384)资助的课题。

摘　　要：相对论扭曲波方法是研究微观粒子碰撞动力学过程的常用理论方法.本文基于多组态Dirac-Hartree-Fock(MCDHF)方法以及相应的程序包GRASP 92/2K/2018和RATIP,发展了一套电子与原子碰撞激发过程的全相对论扭曲波方法和程序.计算了极化电子与原子碰撞激发过程的总截面、微分截面、态多极以及碰撞激发后辐射光子的积分和微分Stokes参数等.讨论了电子关联效应、Breit相互作用和等离子体屏蔽效应对碰撞激发截面的影响.该方法和程序的发展为详细研究复杂靶离子的碰撞激发过程和讨论电子关联效应以及Breit相互作用对碰撞激发过程的影响提供了条件.The electron-atom(ion)collision excitation process is one of the most common inelastic scattering processes.It is of great significance in the fields of astrophysics and laboratory plasma.The relativistic distorted-wave method is a widely used theoretical tool for studying electron-atom(ion)collisions,with the aim of obtaining scattering parameters,such as impact cross sections and rate coefficients.In recent years,we have developed a set of fully relativistic distorted-wave methods and programs of studying the electron-atom collision excitation processes.This method is based on the multi-configuration Dirac-Hartree-Fock(MCDHF)method,together with the corresponding packages GRASP 92/2K/2018 and RATIP.In the present work,continuum state wave functions,total and differential cross sections,state multipoles,integral and differential Stokes parameters of the radiation photon after the impact excitation processes of polarized electrons and atoms are calculated.The influences of electron correlation effects,Breit interaction,and plasma screening effects on the excitation cross sections are discussed.The present methods and programs possess several advantages below.1)In the calculations of the continuum electron wave functions,the direct interaction and exchange interaction between the bound electron and the continuum electron are both included.Then,the antisymmetrized coupling wave function,which is composed of the continuum electron wave function and the continuum ion wave function,is utilized as the wave function of the system.This method is employed to study the low-energy electron scattering process and medium energy electron scattering process.2)In this method,the target state wave function is obtained form the MCDHF theory and the corresponding GRASP packages.The MCDHF method has the advantage of being able to consider the electron correlation effects,including valence-valence,core-valence,and core-core correlations,as well as the influence of Breit interaction and quantum electrodynamics effect on the target sta

关 键 词：电子与原子碰撞激发 相对论扭曲波方法 多组态Dirac-Hartree-Fock方法 

分 类 号：O562.5[理学—原子与分子物理]