Threshold angular distributions of (e,2e) cross sections of helium atoms.
Threshold angular distributions of (e,2e) cross sections of helium atoms.
复制标题
氦原子 (e,2e) 横截面的阈值角分布。
DOI：
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发表时间：
1992
影响因子：
8.6
通讯作者：
Macek Jh
中科院分区：
文献类型：
--
作者：
J. Botero;Macek Jh
共面对称几何结构中氦原子的电子碰撞电离的横截面是通过在库仑玻恩近似中包含归一化因子来计算的，该归一化因子近似地将电子-电子相互作用纳入最终状态波函数中。该近似值与最近在高于电离阈值 0.5 至 5 eV 的冲击能量下的实验观察结果非常吻合。结果表明，本理论给出的角分布与Wannier阈值理论相符。
Cross sections for the electron-impact ionization of helium atoms in a coplanar symmetric geometry are computed by including in the Coulomb-Born approximation a normalization factor which approximately incorporates electron-electron interactions in the final-state wave function. This approximation yields excellent agreement with recent experimental observations at impact energies between 0.5 and 5 eV above the ionization threshold. It is shown that the angular distributions given by the present theory are in agreement with Wannier's threshold theory.