Exploration of interference structure of a hydrogen atom with different wavelengths in a linearly polarized laser field

¹ Institute of Atomic and Molecular Physics, Jilin University - Changchun 130012, PRC
² Institute of Applied Physics and Computational Mathematics - P. O. Box 8009, Beijing 100088, PRC

^(a) liuxs@jlu.edu.cn (corresponding author)

Received: 1 March 2021
Accepted: 7 May 2021

Abstract

We investigate the ionization process of an atom with different wavelengths in a linearly polarized laser field. With the change of wavelength, the interference structure in photoelectron momentum distributions (PMDs) changes obviously. The temporal double-slit fringes can be clearly observed in the relatively high-energy region below the energy of 2U_p for the laser wavelength , but we only observe the temporal double-slit fringes in the relatively low-energy region below the energy of 2U_p for the laser wavelength . By analyzing the number of relative contribution of directly ionized electrons, we find a sensitive dependence of the direct electron on the laser wavelength. In addition, the temporal double-slit fringes can be also observed in the photoelectron momentum distributions in the deep tunneling regime ().