Photoelectron momentum distributions of triatomic CO2 molecules by circularly polarized attosecond pulses

张思琪 ¹张军 ²郝欣宇 ²郭静 ²刘爱华 ²刘学深²

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作者信息

1. Institute of Atomic and Molecular Physics,Jilin University,Changchun 130012,China;School of Physics,Harbin Institute of Technology,Harbin 150001,China
2. Institute of Atomic and Molecular Physics,Jilin University,Changchun 130012,China
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Abstract

Molecular-frame photoelectron momentum distributions(MF-PMDs)have been studied for imaging molecular struc-tures.We investigate the MF-PMDs of C02 molecules exposed to circularly polarized(CP)attosecond laser pulses by solving the time-dependent Schrödinger equations based on the single-active-electron approximation frames.Results show that high-frequency photons lead to photoelectron diffraction patterns,indicating molecular orbitals.These diffraction patterns can be illustrated by the ultrafast photoionization models.However,for the driving pulses with 30 nm,a devia-tion between MF-PMDs and theoretically predicted results of the ultrafast photoionization models is produced because the Coulomb effect strongly influences the molecular photoionization.Meanwhile,the MF-PMDs rotate in the same direction as the helicity of driving laser pulses.Our results also demonstrate that the MF-PMDs in a CP laser pulse are the super-position of those in the parallel and perpendicular linearly polarized cases.The simulations efficiently visualize molecular orbital geometries and structures by ultrafast photoelectron imaging.Furthermore,we determine the contribution of HOMO and HOMO-1 orbitals to ionization by varying the relative phase and the ratio of these two orbitals.

Key words

molecular-frame photoelectron momentum distributions/single-active-electron approximation frames/ultrafast photoionization models

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基金项目

National Natural Science Foundation of China(11974007)

National Natural Science Foundation of China(12074146)

National Natural Science Foundation of China(12074142)

National Natural Science Foundation of China(61575077)

National Natural Science Foundation of China(12374265)

National Natural Science Foundation of China(11947243)

National Natural Science Foundation of China(91850114)

National Natural Science Foundation of China(11774131)

Natural Science Foundation of Jilin Province of China(20220101016JC)

出版年

2024

中国物理B(英文版)

中国物理学会和中国科学院物理研究所

中国物理B(英文版)

CSTPCDEI

影响因子：0.995

ISSN：1674-1056

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