原子轨道强耦合方法研究He^(2+)-H^-碰撞的电荷转移过程  

Atomic Orbital Close-coupling Calculations of Charge Transfer in He^(2+)-H^-Collisions

作　　者：闫世杰[1] 刘玲[2] 王建国[2] 

机构地区：[1]渤海船舶职业学院,辽宁葫芦岛125000 [2]北京应用物理与计算数学研究所计算物理实验室,北京100088

出　　处：《计算物理》2009年第2期254-260,共7页Chinese Journal of Computational Physics

基　　金：国家自然科学基金(课题号:10574018;10574020和10734140)资助项目

摘　　要：应用双中心原子轨道强耦合方法研究He2+-H-碰撞的单次电荷转移过程.计算中,对入射粒子He2+,包含n=1~7的所有束缚态,计算的能量本征值与NIST标准数据在百分之几的精度内符合很好;对靶H-,包括一个束缚态1s和五个连续态ns(n=2~6),束缚态能量与他人理论结果一致.在4~400 keV的入射粒子能量范围,计算单电子俘获过程的总截面及到各个壳层上的态选择截面.发现在较低的入射粒子能量,电子主要俘获到He+离子主量子数n=3~5的壳层,高能区俘获到n=2的壳层为主;对同一主量子数n,在低能区俘获到高角动量态(l=n-1,n-2)的电荷转移截面相对较大,在高能区主要俘获到l=1的p壳层.同时还计算入射粒子能量分别为4 keV和400 keV时,电子俘获到激发态辐射退激发产生的电荷转移发射光谱,并发现cascade效应的影响很大.Charge transfer in ^2＋ -H^-collisions is investigated using two-center atomic orbital close-coupling （TC-AOCC） method. All bound states of He^＋ （n/） with n ≤ 7, as well as ls bound states and n s （n = 2 - 6） quasi-continuum states of H^- are included in the AOCC basis. Energies of bound states calculated are in good agreement with NIST data and theoretical results. The total and state-selective cross sections are calculated within a range of energy from 4 to 400 keY. For low-energy collisions, dominant capturing channels are those with quantum numbers n = 3 - 5. With increasing incident energies, transfer of charge to n = 2 becomes the dominant reaction. Moreover, for lowenergy collisions, cross sections for electrons capture to higher-l states are bigger than that to lower l states. For high-energy collisions, dominant channel is to l = 1 states. Charge exchange spectrum due to electron captured to excited states is calculated. Importance of cascade effects is found.

关 键 词：电荷转移截面 原子轨道强耦合方法 电荷转移发射光谱 

分 类 号：O562.5[理学—原子与分子物理]