1KeV电子入射单电离氦原子三重微分散射截面的理论研究

用3C模型、DS3C模型对1KeV电子入射氦原子(e,2e)反应中的三重微分散射截面进行了计算,并将理论计算结果与实验数据进行了比较,研究了各种屏蔽效应对散射平面内以及垂直平面内三重微分散射截面的影响,并对三重微分散射截面变化规律进行了探讨.结果表明:各种屏蔽效应对散射平面内三重微分散射截面的贡献可以忽略;而在垂直平面内,这些效应对三重微分散射截面结构存在较强影响;另外,末态出射电子与靶核的相互作用直接影响散射平面内和垂直平面内截面的结构及其变化规律.

A theoretical study on the triple differential cross section for electron impact ionization of helium at incident energy of 1KeV

Under the condition of 1KeV incident energy, by making use of 3C model and DS3C model, the triple differential cross sections of electron-impact single ionization of the ground state of helium are calculated. The results are compared with those of corresponding experiments to systematically make a research on the influence of various screening effects on the triple differential cross section in the scattering plane and the perpendicular plane. The change tendency of triple differential cross section is analysed. It is shown that the influences of final channel screening effect and distorting effect on the triple differential cross sections in the scattering plane can be ignored. The influence of these effects on the triple differential cross sections in the perpendicular plane is stronger. In addition, the contributions of interreaction between outgoing electrons and nucleus to the change tendency of differential cross sections in the scattering plane and perpendicular plane are stronger.