Multiphoton ionization distributions beyond the dipole approximation: Retardation versus recoil corrections

• URL: http://arxiv.org/abs/2412.17996v1
• Date: Mon, 23 Dec 2024 21:38:46 GMT
• Title: Multiphoton ionization distributions beyond the dipole approximation: Retardation versus recoil corrections
• Authors: J. Z. Kamiński, K. Krajewska,
• Abstract summary: We study nondipole effects in ionization of a two-dimensional hydrogen-like atom by a flat-top laser pulse of varied intensity. A directional dependence of the energy-angular photoelectron distributions is demonstrated numerically. The retardation correction originating from the space- and time-dependence of the laser field leads to a tiny redshift of the photoelectron energy spectra.
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• Abstract: We study nondipole effects in multiphoton ionization of a two-dimensional hydrogen-like atom by a flat-top laser pulse of varied intensity. For this purpose, we solve numerically a two-dimensional Schr\"odinger equation treating a propagating laser pulse exactly. The resulting distributions are then compared to those calculated in the dipole approximation. A directional dependence of the energy-angular photoelectron distributions is demonstrated numerically in the case of a propagating laser pulse of a moderate and a high intensity. It is analytically interpreted based on the leading order relativistic expansion of the electron Volkov state, showing a significant contribution of the electron recoil to that behavior. In contrast, the retardation correction originating from the space- and time-dependence of the laser field leads to a tiny redshift of the photoelectron energy spectra. Other features of ionization distributions are also analyzed, including the sidelobes and the double-hump structures of multiphoton peaks, or their disappearance for intense propagating laser pulses.

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