氙在VUV区的多光子电离
Multiphoton ionization of xenon in the VUV regime
摘要：
最近在汉堡DESY的真空紫外自由电子激光装置上进行的一项实验中，观察到了氙原子气体中多电荷离子的产生。本文发展了氙及其离子多光子电离的理论描述。数值结果支持了实验观测可以用几个真空紫外光子的非线性吸收来解释的观点。该方法基于Hartree-Fock-Slater独立粒子模型。在Floquet方案中处理多光子物理。利用复吸收势解决了光电子的连续性问题。速率方程的离子群体的整合，考虑到个别真空紫外激光脉冲的时间结构。讨论了自由电子激光束的空间分布对氙电荷态分布的影响。在氙离子的真空紫外多光子电离过程中可能存在俄歇型多电子机制。
英文摘要：
In a recent experiment at the VUV free-electron laser facility at DESY in Hamburg, the generation of multiply charged ions in a gas of atomic xenon was observed. This paper develops a theoretical description of multiphoton ionization of xenon and its ions. The numerical results lend support to the view that the experimental observation may be interpreted in terms of the nonlinear absorption of several VUV photons. The method rests on the Hartree-Fock-Slater independent-particle model. The multiphoton physics is treated within a Floquet scheme. The continuum problem of the photoelectron is solved using a complex absorbing potential. Rate equations for the ionic populations are integrated to take into account the temporal structure of the individual VUV laser pulses. The effect of the spatial profile of the free-electron laser beam on the distribution of xenon charge states is included. An Auger-type many-electron mechanism may play a role in the VUV multiphoton ionization of xenon ions.
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