Al原子K壳层光电离的理论研究

Theoretical studies on the K shell photoionization processes of Al atom

基于多组态Dirac-Fock理论方法及其相应的GRASP2K和修改后的RATIP2012程序包,计算了极化光子入射Al原子K壳层光电离截面,并利用最新发展的RPI-E计算程序研究了K壳层光电子角分布,重点讨论了辐射场的非偶极项对光电离截面和光电子角分布的影响.结果表明,在入射光子5000 e V能量范围内,辐射场的非偶极效应对光电离总截面的影响可以忽略不计.随着入射光子能量的增加,辐射场的非偶极效应对光电子角分布的影响越来越大,入射光子能量在5000 eV,一级非偶极参数γ的数值达到1.5.

Based on the multiconfiguration Dirac-Fock method and the corresponding packages GRASP2K and the modified RATIP2012,the K-shell photoionization cross sections of the Al atom have been calculated with polarized incident light,as well as the newly developed RPI-E has been used to study the angular distribution of the K shell photoionization.Special attention is paid to the effects of the non-dipole term of the radiation field on the photoionization cross section and the photoelectron angular distribution has been discussed.The results show that the influence of the non-dipole effect of the radiation field on the total photoionization cross section can be neglected in the range of the incident photon 5000 eV energy.With the increase of the incident photon energy,the non-dipole effect is more and more important for the photoelectron angular distribution.The value of the first dipole parameterγis 1.5 when the incident photon energy is 5000 eV.