中国物理B ›› 2023, Vol. 32 ›› Issue (2): 23201-023201.doi: 10.1088/1674-1056/ac9b36

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Wavelength- and ellipticity-dependent photoelectron spectra from multiphoton ionization of atoms

Keyu Guo(郭珂雨)1, Min Li(黎敏)1,†, Jintai Liang(梁锦台)1, Chuanpeng Cao(曹传鹏)1, Yueming Zhou(周月明)1, and Peixiang Lu((陆培祥)1,2   

  1. 1 School of Physics and Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China;
    2 Optics Valley Laboratory, Wuhan 430074, China
  • 收稿日期:2022-09-09 修回日期:2022-10-07 接受日期:2022-10-19 出版日期:2023-01-10 发布日期:2023-01-31
  • 通讯作者: Min Li E-mail:mli@hust.edu.cn
  • 基金资助:
    Project supported by National Key Research and Development Program of China (Grant No. 2019YFA0308300) and the National Natural Science Foundation of China (Grant Nos. 12021004 and 61475055).

Wavelength- and ellipticity-dependent photoelectron spectra from multiphoton ionization of atoms

Keyu Guo(郭珂雨)1, Min Li(黎敏)1,†, Jintai Liang(梁锦台)1, Chuanpeng Cao(曹传鹏)1, Yueming Zhou(周月明)1, and Peixiang Lu((陆培祥)1,2   

  1. 1 School of Physics and Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China;
    2 Optics Valley Laboratory, Wuhan 430074, China
  • Received:2022-09-09 Revised:2022-10-07 Accepted:2022-10-19 Online:2023-01-10 Published:2023-01-31
  • Contact: Min Li E-mail:mli@hust.edu.cn
  • Supported by:
    Project supported by National Key Research and Development Program of China (Grant No. 2019YFA0308300) and the National Natural Science Foundation of China (Grant Nos. 12021004 and 61475055).

摘要: We theoretically study the photoelectron momentum distributions from multiphoton ionization of a model lithium atom over a range of laser wavelengths from 500 nm to 700 nm by numerically solving the time-dependent Schrödinger equation. The photoelectron momentum distributions display many ring-like patterns for the three-photon ionization, which vary dramatically with the change of the laser wavelength. We show that the wavelength-dependent photoelectron energy spectrum can be used to effectively identify the resonant and nonresonant ionization pathways. We also find an abnormal ellipticity dependence of the electron yield for the (2+1) resonance-enhanced ionization via the 4d intermediate state, which is relevant to the two-photon excitation probability from the ground state to the 4d state.

关键词: multiphoton ionization, ultrafast phenomena, Freeman resonance

Abstract: We theoretically study the photoelectron momentum distributions from multiphoton ionization of a model lithium atom over a range of laser wavelengths from 500 nm to 700 nm by numerically solving the time-dependent Schrödinger equation. The photoelectron momentum distributions display many ring-like patterns for the three-photon ionization, which vary dramatically with the change of the laser wavelength. We show that the wavelength-dependent photoelectron energy spectrum can be used to effectively identify the resonant and nonresonant ionization pathways. We also find an abnormal ellipticity dependence of the electron yield for the (2+1) resonance-enhanced ionization via the 4d intermediate state, which is relevant to the two-photon excitation probability from the ground state to the 4d state.

Key words: multiphoton ionization, ultrafast phenomena, Freeman resonance

中图分类号:  (Photoionization and excitation)

  • 32.80.-t
33.80.Rv (Multiphoton ionization and excitation to highly excited states (e.g., Rydberg states)) 32.80.Rm (Multiphoton ionization and excitation to highly excited states)