Two-center interference and stereo Wigner time delay in photoionization of asymmetric molecules

Yijie Liao, Yueming Zhou, Liang-Wen Pi, Qinghua Ke, Jintai Liang, Yong Zhao, Min Li, and Peixiang Lu

Phys. Rev. A 104, 013110 – Published 20 July 2021

Abstract

We present numerical simulations of the time delay in photoemission of asymmetric diatomic molecules using the technique of reconstruction of attosecond beating by interference of two-photon transitions (RABITT) by solving the time-dependent Schrödinger equation. Our results show an obvious time delay between photoelectrons emitted to the left and right and this relative time delay oscillates as the photoelectron energy changes. More interestingly, the amplitude of this oscillation increases when the asymmetry degree of diatomic molecules decreases. With the method of the selected continuum wave functions, we calculate the Wigner time delay in photoionization. The obtained stereo Wigner time delay also oscillates with photoelectron energy. This oscillation is traced back to two-center interferences and it could explain the relative time delay in the RABITT measurement. Furthermore, our results indicate that the continuum-continuum time delay in photoemission of heteronuclear molecules is asymmetric.

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Received 19 May 2021
Accepted 9 July 2021

DOI:https://doi.org/10.1103/PhysRevA.104.013110

Physics Subject Headings (PhySH)

Atomic & molecular processes in external fields Atomic & molecular structure

Atomic, Molecular & Optical

Authors & Affiliations

Yijie Liao ¹, Yueming Zhou ^1,*, Liang-Wen Pi ^2,3,†, Qinghua Ke¹, Jintai Liang¹, Yong Zhao¹, Min Li¹, and Peixiang Lu^1,4,5,‡

¹School of Physics and Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China
²State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics of the Chinese Academy of Sciences, Xi'an 710119, China
³University of Chinese Academy of Science, Beijing 100049, China
⁴Hubei Key Laboratory of Optical Information and Pattern Recognition, Wuhan Institute of Technology, Wuhan 430205, China
⁵CAS Center for Excellence in Ultra-intense Laser Science, Shanghai 201800, China

^*zhouymhust@hust.edu.cn
^†lwpi@opt.ac.cn
^‡lupeixiang@hust.edu.cn

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Issue

Vol. 104, Iss. 1 — July 2021

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