The Coulomb effects in laser-assisted single photoionization

Attosecond photoionization time delays reveal information about an outgoing electron getting away from the Coulomb potential. In this study, we improve the eikonal approximation model that overestimates the laser-Coulomb coupling effect in the laser-assisted photoionization of atoms. The improved ei...

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Bibliographic Details
Published in:Optics communications 2021-04, Vol.485, p.126759, Article 126759
Main Authors: Yang, Yi, Wang, Feng, Liu, Kai, Tang, Fuming, Tu, Qian, Xiong, ZhangTao, Wang, Zhe, Zhang, Xiaofan, Qin, Meiyan, Liao, Qing
Format: Article
Language:English
Subjects:
Coulomb effect
Single photoionization
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Summary:Attosecond photoionization time delays reveal information about an outgoing electron getting away from the Coulomb potential. In this study, we improve the eikonal approximation model that overestimates the laser-Coulomb coupling effect in the laser-assisted photoionization of atoms. The improved eikonal approximation model can be accurate on about the 2 asec level relative to the time-dependent Schrödinger equation results. The improvement of photoionization time delays demonstrates that the electrons ionized by extreme ultraviolet attosecond pulse possesses momentum larger than the asymptotical momentum due to the attractive Coulomb potential of the parent ion. These results will give a deeper insight into understanding the laser-assisted single photoionization.
ISSN:0030-4018
1873-0310
DOI:10.1016/j.optcom.2021.126759