Five-photon sequential double ionization of He in intense extreme-ultraviolet free-electron laser fields

Five-photon sequential double ionization of He in intense extreme-ultraviolet free-electron laser fields
复制标题

强极紫外自由电子激光场中 He 的五光子连续双电离

DOI：
10.1103/physreva.90.053403
复制
发表时间：
2014
期刊：
Phys. Rev. A
影响因子：
--
通讯作者：
T. Ishikawa and A. Hishikawa
T. Ishikawa and A. Hishikawa
中科院分区：
--
文献类型：
--
作者：
Y. Hikosaka;M. Fushitani;A. Matsuda;T. Endo;Y. Toida;E. Shigemasa;M. Nagasono;K. Tono;T. Togashi;M. Yabashi;T. Ishikawa and A. Hishikawa

文献摘要

相似文献

用逐发光电子能谱研究了氦原子在极紫外自由电子激光场中的多光子电离过程。在其周围观察到一个由He的五光子吸收引起的连续双电离产生的光电子峰。对光电子能谱的逐点分析表明，从基态到基态的双光子共振是五光子双电离增强的主要原因。得到了态和态之间的双光子吸收和态的单光子吸收的有效截面。
A multiphoton ionization process of He in intense extreme ultraviolet free-electron laser fields is investigated in a photon energy range ofusing shot-by-shot photoelectron spectroscopy. A photoelectron peak resulting from sequential double ionization of He due to five-photon absorption is observed around. Shot-by-shot analysis of photoelectron spectra shows that two-photon resonance to thestate from theground state is responsible for the substantial enhancement of five-photon double ionization. Effective cross sections for two-photon absorption between theandstates ofand for one-photon absorption from thestate are obtained.