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 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
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.
(Multiphoton ionization and excitation to highly excited states)
Fund: 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).
Corresponding Authors:
Min Li
E-mail: mli@hust.edu.cn
Cite this article:
Keyu Guo(郭珂雨), Min Li(黎敏), Jintai Liang(梁锦台), Chuanpeng Cao(曹传鹏), Yueming Zhou(周月明), and Peixiang Lu((陆培祥) Wavelength- and ellipticity-dependent photoelectron spectra from multiphoton ionization of atoms 2023 Chin. Phys. B 32 023201
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