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    Ionization and recombination times of the long trajectory in high-order harmonic generation

    Shengjun Yue1,2,3, Yangyang Li1,2, Shan Xue1,2,*, Hongchuan Du1,2,†, and Manfred Lein3

    • 1Frontiers Science Center for Rare Isotopes, Lanzhou University, Lanzhou 730000, China
    • 2School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
    • 3Leibniz University Hannover, Institute of Theoretical Physics, Appelstraße 2, 30167 Hannover, Germany

    • *xuesh@lzu.edu.cn
    • †duhch@lzu.edu.cn
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    Phys. Rev. A 106, 023117 – Published 26 August, 2022

    DOI: https://doi.org/10.1103/PhysRevA.106.023117

    Abstract

    Measuring the ionization and recombination times in high-order harmonic generation driven by strong laser fields is of fundamental importance in attosecond science and vital for assessing the temporal accuracy of trajectory-resolved high-harmonic spectroscopy. We investigate the effect of the electron-core interaction on the ionization and recombination times of the long trajectory in high-order harmonic generation. Using a classical model and the analytical R-matrix theory for helium, it is found that the attractive interaction leads to a 30-as shift of the ionization times for the long trajectory. By numerically solving the time-dependent Schrödinger equation for a helium atom model, we demonstrate that this small time shift can be probed by using orthogonally polarized two-color fields with high probe frequencies.

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    Phys. Rev. A 106, 023117– Published 26 August, 2022
    • Received 12 May 2022
    • Accepted 29 July 2022
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