Two-center electron-impact ionization via collisional excitation-autoionization
Two-center electron-impact ionization via collisional excitation-autoionization
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DOI：
10.1103/physreva.100.032702
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发表时间：
2019-06
影响因子：
2.9
通讯作者：
F. Grull;A. Voitkiv;C. Muller
中科院分区：
文献类型：
--
作者：
F. Grull;A. Voitkiv;C. Muller
研究了原子或离子在相邻原子存在下的电子碰撞电离。后者首先被入射电子碰撞激发，其能量被假定为高但非相对论性的。之后，激发能量通过双中心俄歇过程无辐射地转移到另一个原子或离子，导致其电离。我们表明，相邻原子的参与体现在一个非常明显的共振峰的能量微分截面，并可以大大提高电子碰撞电离的总截面。我们还讨论了邻近原子对电子角分布的影响。
Electron-impact ionization of an atom or ion in the presence of a neighboring atom is studied. The latter is first collisionally excited by the incident electron, whose energy is assumed to be high but nonrelativistic. Afterwards, the excitation energy is transferred radiationlessly via a two-center Auger process to the other atom or ion, leading to its ionization. We show that the participation of the neighboring atom manifests in a very pronounced resonance peak in the energy-differential cross section and can substantially enhance the total cross section of electron-impact ionization. We also discuss the influence of the neighbouring atom on the angular distribution of the ejected electron.