Photoelectron combs in ionization: Influence of rescattering and nondipole effects
Phys. Rev. A 113, 063102 – Published 2 June, 2026
DOI: https://doi.org/10.1103/5npq-4655
Abstract
Ionization by a sequence of extreme ultraviolet pulses is investigated based on the rigorous numerical solution of the time-dependent Schrödinger equation, when the driving laser field is treated exactly. This goes beyond the typically used first-order nondipole approximation and reveals the effects of radiation pressure to its full extent. Specifically, we observe the comb structures in the angle-resolved energy distributions of photoelectrons. The comb peaks are shifted, however, depending on the electron emission angle. While a similar effect has already been observed in the first-order nondipole approximation, upon increasing the laser field strength the discrepancy with our exact results becomes more pronounced. Also, we observe the additional substructure of the comb peaks arising in the energy distributions of photoelectrons. Finally, as our numerical calculations account for the atomic potential in the entire interaction region, we observe the loss of coherence of comb structures upon increasing the number of laser pulses, which we attribute to rescattering.
