中国物理B ›› 2020, Vol. 29 ›› Issue (7): 73202-073202.doi: 10.1088/1674-1056/ab90ef

• ATOMIC AND MOLECULAR PHYSICS • 上一篇    下一篇

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

Fengzheng Zhu(朱风筝), Genliang Li(黎根亮), Aihua Liu(刘爱华)   

  1. 1 Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China;
    2 School of Mathematics and Physics, Hubei Polytechnic University, Huangshi 435003, China
  • 收稿日期:2020-03-21 修回日期:2020-04-28 出版日期:2020-07-05 发布日期:2020-07-05
  • 通讯作者: Aihua Liu E-mail:aihualiu@jlu.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 11774131 and 91850114).

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

Fengzheng Zhu(朱风筝)1,2, Genliang Li(黎根亮)1, Aihua Liu(刘爱华)1   

  1. 1 Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China;
    2 School of Mathematics and Physics, Hubei Polytechnic University, Huangshi 435003, China
  • Received:2020-03-21 Revised:2020-04-28 Online:2020-07-05 Published:2020-07-05
  • Contact: Aihua Liu E-mail:aihualiu@jlu.edu.cn
  • Supported by:
    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 Schrödinger 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

Abstract: 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 Schrödinger 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.

Key words: laser-assisted, double photoionization, helium atom, angular distribution

中图分类号:  (Photoionization and excitation)

  • 32.80.-t
42.65.Re (Ultrafast processes; optical pulse generation and pulse compression) 87.64.mn (Multiphoton)