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

作　　者：郭珂雨 黎敏 梁锦台 曹传鹏 周月明 陆培祥 Keyu Guo;Min Li;Jintai Liang;Chuanpeng Cao;Yueming Zhou;Peixiang Lu(School of Physics and Wuhan National Laboratory for Optoelectronics,Huazhong University of Science and Technology,Wuhan 430074,China;Optics Valley Laboratory,Wuhan 430074,China)

机构地区：[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

出　　处：《Chinese Physics B》2023年第2期223-228,共6页中国物理B（英文版）

基　　金：supported by National Key Research and Development Program of China (Grant No. 2019YFA0308300);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 Schr ¨odinger 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 

分 类 号：O562[理学—原子与分子物理]