Abstract
To bypass the difficulty of solving the one-electron time-dependent Schrödinger equation in momentum space with the interacting nonlocal Coulomb potential, we have recently formulated an alternative accurate and efficient ab initio treatment (Ongonwou et al., Ann Phys 375:471, 2016; Ekogo et al., Phys Scr 97:115402, 2022), which relies on the expansion of the atomic wave function and the interacting nonlocal Coulomb potential on a discrete basis set of Coulomb Sturmian functions in momentum space. To further illustrate the validation and credibility of our proposed theoretical and numerical approaches, we study the above-threshold ionization of the hydrogen atom exposed to ultrashort infrared, ultraviolet, and low-and-high-frequency laser pulses. The energy spectra, momentum, angular distributions of the photoelectrons, and bound-state populations at the end of the laser pulse have been numerically evaluated, analyzed, and compared against predictions of other well-known time-dependent calculations in the literature. They are obtained either by using the ionized wave function or by projecting the total electron wave packets at the end of the laser pulse onto the continuum states constructed using the incoming Coulomb wave function. We explore the physical observables’ dependence on the carrier-envelope phase of the laser pulses. Our theoretical model captures the left–right dependence and breaks backward–forward symmetry in the emitted photoelectron momentum and angular distributions.
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Acknowledgements
The authors thank the Université Catholique de Louvain (UCL, Belgium) for providing them with access to the supercomputer of the Calcul Intensif et Stockage de Masse (CISM/UCL). They gratefully acknowledge partial support of this work by the Abdus Salam International Centre for Theoretical Physics (ICTP) under the OEA-AF-12 project. H.M.T.N and M.G.K.N. thank Professor Bernard Piraux for his warm hospitality at UCL and the active cooperation between his laboratory and CEPAMOQ.
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Tetchou Nganso, H.M., Abdouraman & Kwato Njock, M.G. Ionization of hydrogen atom driven by ultrashort intense laser pulses: study in momentum space of phase-dependent effects. Indian J Phys 98, 1937–1950 (2024). https://doi.org/10.1007/s12648-023-02972-w
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DOI: https://doi.org/10.1007/s12648-023-02972-w