Photoelectron momentum distributions of triatomic CO_(2)molecules by circularly polarized attosecond pulses  

作　　者：Si-Qi Zhang Jun Zhang Xin-Yu Hao Jing Guo Aihua Liu Xue-Shen Liu 张思琪;张军;郝欣宇;郭静;刘爱华;刘学深(Institute of Atomic and Molecular Physics,Jilin University,Changchun 130012,China;School of Physics,Harbin Institute of Technology,Harbin 150001,China)

机构地区：[1]Institute of Atomic and Molecular Physics,Jilin University,Changchun 130012,China [2]School of Physics,Harbin Institute of Technology,Harbin 150001,China

出　　处：《Chinese Physics B》2024年第10期220-225,共6页中国物理B（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.11974007,12074146,12074142,61575077,12374265,11947243,91850114,and 11774131);the Natural Science Foundation of Jilin Province of China(Grant No.20220101016JC).

摘　　要：Molecular-frame photoelectron momentum distributions(MF-PMDs)have been studied for imaging molecular structures.We investigate the MF-PMDs of CO_(2)molecules exposed to circularly polarized(CP)attosecond laser pulses bysolving the time-dependent Schrodinger equations based on the single-active-electron approximation frames.Results showthat high-frequency photons lead to photoelectron diffraction patterns,indicating molecular orbitals.These diffractionpatterns can be illustrated by the ultrafast photoionization models.However,for the driving pulses with 30 nm,a deviationbetween MF-PMDs and theoretically predicted results of the ultrafast photoionization models is produced because theCoulomb effect strongly influences the molecular photoionization.Meanwhile,the MF-PMDs rotate in the same directionas the helicity of driving laser pulses.Our results also demonstrate that the MF-PMDs in a CP laser pulse are the superpositionof those in the parallel and perpendicular linearly polarized cases.The simulations efficiently visualize molecularorbital geometries and structures by ultrafast photoelectron imaging.Furthermore,we determine the contribution of HOMOand HOMO-1 orbitals to ionization by varying the relative phase and the ratio of these two orbitals.

关 键 词：molecular-frame photoelectron momentum distributions single-active-electron approximation frames ultrafast photoionization models 

分 类 号：O56[理学—原子与分子物理]