Doubly resonant three-photon double ionization of Ar atoms induced by an EUV free-electron laser
Doubly resonant three-photon double ionization of Ar atoms induced by an EUV free-electron laser
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EUV 自由电子激光诱导 Ar 原子双共振三光子双电离
DOI：
10.1103/physreva.84.063405
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发表时间：
2011-12-05
影响因子：
2.9
通讯作者：
Ishikawa, T.
中科院分区：
文献类型：
--
作者：
Gryzlova, E. V.;Ma, Ri;Ishikawa, T.
本文揭示了极紫外自由电子激光脉冲作用下原子三光子双电离的一种机制，即在一个连续的过程中，通过离子共振双光子电离进行的第二步电离被离子自电离态的激发所强烈增强。与传统模型不同，该机制解释了氩原子三光子双电离过程中观察到的光电子峰的相对强度及其角度依赖性。
A mechanism for three-photon double ionization of atoms by extreme-ultraviolet free-electron laser pulses is revealed, where in a sequential process the second ionization step, proceeding via resonant two-photon ionization of ions, is strongly enhanced by the excitation of ionic autoionizing states. In contrast to the conventional model, the mechanism explains the observed relative intensities of photoelectron peaks and their angular dependence in three-photon double ionization of argon.