摘要
在三体索末菲参量修正的基础上，进一步对（ｅ，２ｅ）反应的末态Ｈｅ＋中核外电子的有效屏蔽给出修正．这种修正反映了末态四粒子间的动力学屏蔽．并用修正后的索末菲参量计算了入射能量为５０ｅＶ时，共面不对称几何条件下电子离化Ｈｅ原子的三重微分截面．所得结果与ｃｏｎｖｅｒｇｅｎｔｃｌｏｓｅｃｏｕｐｌｉｎｇ理论结果及最新绝对测量的实验数据进行比较，发现当敲出电子能量为１０ｅＶ时，理论曲线更接近实验数据．
Abstract Based on
the modified three body Sommerfeld parameters,the effective shield of the residual electron in
the final state of He + is further modified for (e,2e) processes. Such a modification represents a
dynamic screening of the four bodies in the final state. The triple differential cross sections for
electron impact ionization of atomic helium at an incident energy of 50eV in the asymmetric
geometry are calculated by use of the modified Sommerfeld parameters.The results were
compared with those of the absolute measurements and the only existing theoretical results of
the convergent colse coupling method.It was found that the present results give a better
description for the experimental data at fixed ejected energy of 10eV.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
1999年第3期453-460,共8页
Acta Physica Sinica
基金
国家自然科学基金
安徽省教育委员会科研基金
