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arXiv · 2412.19378

Nondipole circularly polarized laser-assisted photoelectron emission

R. Della Picca·J. M. Randazzo·S. D. López·M. F. Ciappina·D. G. Arbó
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Abstract

We theoretically study atomic laser-assisted photoelectric emission (LAPE) beyond the electric dipole approximation. We present a theoretical description for first-order nondipole corrections ($O(c^{-1})$ where $c$ is the speed of light) to the nonrelativistic description of the laser-atom interaction for a strong circularly polarized infrared (IR) laser field combined with a train of extreme-ultraviolet (XUV) laser pulses. We investigate the photoelectron momentum distribution (PMD) as the product of two main contributions: the intra- and interpulse factors. Whereas the interpulse factor gives rise to a sideband pattern with a shift opposite to the IR beam propagation direction, the intrapulse factor forms an angular streaking pattern following the IR time-dependent polarization direction. We explore the transition of the PMD from the dipole to the nondipole framework, showing the gradual break of the forward-backward symmetry as the laser parameters are varied. Furthermore, we find non-zero contributions in dipole forbidden directions independent of the IR polarization state, wherein Cooper-\textit{like} minima are observed. Our work lays a theoretical foundation for understanding time-resolved nondipole LAPE in cutting-edge ultrafast experiments.

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R. Della Picca, J. M. Randazzo, S. D. López, M. F. Ciappina, D. G. Arbó. 2024-12-26. Nondipole circularly polarized laser-assisted photoelectron emission. https://arxiv.org/abs/2412.19378

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