A time-dependent close-coupling method for three-electron atomic systems is used to calculate the electron-impact double ionization of the He (1s2s ³ S) excited state. Partial cross sections are calculated for total angular momenta from . An exponential fitting expression is used to extend the calculated partial cross sections to . The total cross sections at three different incident energies are compared with recent crossed-beams measurements and are found to lie within the experimental error bars. The magnitude of the double ionization cross section is found to be similar to that of the double ionization cross section from the ground state of He.

中文翻译：

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He 的电子冲击双电离 (1s2s 3 S)

三电子原子系统的时间相关的紧密耦合方法用于计算 He (1 s 2 s ³ S ) 激发态的电子碰撞双电离。从 计算总角动量的部分横截面。指数拟合表达式用于将计算的部分横截面扩展到。三种不同入射能量下的总横截面与最近的横梁测量进行比较，发现位于实验误差条内。发现双电离截面的大小与来自 He 基态的双电离截面的大小相似。