中国物理B ›› 2018, Vol. 27 ›› Issue (7): 73203-073203.doi: 10.1088/1674-1056/27/7/073203

• ATOMIC AND MOLECULAR PHYSICS • 上一篇    下一篇

Above-threshold ionization of hydrogen atom in chirped laser fields

Yuan-Yuan Ni(倪园园), Song-Feng Zhao(赵松峰), Xiao-Yong Li(李小勇), Guo-Li Wang(王国利), Xiao-Xin Zhou(周效信)   

  1. 1 Key Laboratory of Atomic and Molecular Physics and Functional Materials of Gansu Province, College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070, China;
    2 Experimental Center, Northwest University for Nationalities, Lanzhou 730030, China
  • 收稿日期:2018-03-12 修回日期:2018-04-13 出版日期:2018-07-05 发布日期:2018-07-05
  • 通讯作者: Song-Feng Zhao E-mail:zhaosf@nwnu.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 11664035, 11465016, 11764038, 11364038, and 11564033).

Above-threshold ionization of hydrogen atom in chirped laser fields

Yuan-Yuan Ni(倪园园)1, Song-Feng Zhao(赵松峰)1, Xiao-Yong Li(李小勇)2, Guo-Li Wang(王国利)1, Xiao-Xin Zhou(周效信)1   

  1. 1 Key Laboratory of Atomic and Molecular Physics and Functional Materials of Gansu Province, College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070, China;
    2 Experimental Center, Northwest University for Nationalities, Lanzhou 730030, China
  • Received:2018-03-12 Revised:2018-04-13 Online:2018-07-05 Published:2018-07-05
  • Contact: Song-Feng Zhao E-mail:zhaosf@nwnu.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 11664035, 11465016, 11764038, 11364038, and 11564033).

摘要: Above-threshold ionization (ATI) of a hydrogen atom exposed to chirped laser fields is investigated theoretically by solving the time-dependent Schrödinger equation. By comparing the energy spectra, the two-dimensional momentum spectra, and the angular distributions of photoelectron for the laser pulses with different chirp rates, we show a very clear chirp dependence both in the multiphoton and tunneling ionization processes but no chirp dependence in the single-photon ionization. We find that the chirp dependence in the multiphoton ionization based ATI can be attributed to the excited bound states. In the single-photon and tunneling ionization regimes, the electron can be removed directly from the ground state and thus the excited states may not be very important. It indicates that the chirp dependence in the tunneling ionization based ATI processes is mainly due to the laser pulses with different chirp rates.

关键词: above-threshold ionization, chirped laser field, time-dependent Schrödinger equation

Abstract: Above-threshold ionization (ATI) of a hydrogen atom exposed to chirped laser fields is investigated theoretically by solving the time-dependent Schrödinger equation. By comparing the energy spectra, the two-dimensional momentum spectra, and the angular distributions of photoelectron for the laser pulses with different chirp rates, we show a very clear chirp dependence both in the multiphoton and tunneling ionization processes but no chirp dependence in the single-photon ionization. We find that the chirp dependence in the multiphoton ionization based ATI can be attributed to the excited bound states. In the single-photon and tunneling ionization regimes, the electron can be removed directly from the ground state and thus the excited states may not be very important. It indicates that the chirp dependence in the tunneling ionization based ATI processes is mainly due to the laser pulses with different chirp rates.

Key words: above-threshold ionization, chirped laser field, time-dependent Schrödinger equation

中图分类号:  (Multiphoton ionization and excitation to highly excited states)

  • 32.80.Rm
42.50.Hz (Strong-field excitation of optical transitions in quantum systems; multiphoton processes; dynamic Stark shift)