Laser-assisted XUV double ionization of helium atoms:Intensity dependence of joint angular distributions  

作　　者：Fengzheng Zhu Genliang Li Aihua Liu 朱风筝;黎根;刘爱华(Institute of Atomic and Molecular Physics,Jilin University,Changchun 130012,China;School of Mathematics and Physics,Hubei Polytechnic University,Huangshi 435003,China)

机构地区：[1]Institute of Atomic and Molecular Physics,Jilin University,Changchun 130012,China [2]School of Mathematics and Physics,Hubei Polytechnic University,Huangshi 435003,China

出　　处：《Chinese Physics B》2020年第7期281-285,共5页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Grant Nos.11774131 and 91850114).

摘　　要：We investigate the intensity effect of ultrashort assisting infrared laser pulse on the single-XUV-photon double ionization of helium atoms by solving full six-dimensional time-dependent Schrodinger equation with implement of finite element discrete variable representation.The studies of joint energy distributions and joint angular distributions of the two photoelectrons reveal the competition for ionized probabilities between the photoelectrons with odd parity and photoelectrons with even parity in single-XUV-photon double ionization process in the presence of weak infrared laser field,and such a competition can be modulated by changing the intensity of the weak assisting-IR laser pulses.The emission angles of the two photoelectrons can be adjusted by changing the laser parameters as well.We depict how the assisting-IR laser field enhances and/or enables the back-to-back and side-by-side emission of photoelectrons created in double ionization process.

关 键 词：laser-assisted double photoionization helium atom angular distribution 

分 类 号：TN24[电子电信—物理电子学] O562.4[理学—原子与分子物理]