OPTICS AND NUCLEAR PHYSICS

Two-photon ionization of single atoms localized on the Bessel beam axis

M. D. Kiselev^abc, E. V. Gryzlova^b, M. M. Popova^b, A. N. Grum-Grzhimailo<sup>ba

a</sup> School of Physics and Engineering, ITMO University, St. Petersburg, 197101 Russia
^b Skobeltsyn Institute of Nuclear Physics, Moscow State University, Moscow, 119991 Russia
^c Laboratory for Modeling of Quantum Processes, Pacific National University, Khabarovsk, 680035 Russia

Abstract: In the article the effect of twisting of Bessel radiation on two-photon ionization of single atoms localized on the axis of the incident beam is studied. The matrix element of two-photon ionization of this type is obtained for arbitrary polarization and multipolarity of the incident radiation. The differential and integral probability of ionization of an atom over the photoemission angle is analyzed. Illustrative calculations are performed for helium and neon atoms in the simplest case of a circularly polarized field in the electric dipole approximation in the single-active-electron model.

Received: 02.10.2024
Revised: 29.10.2024
Accepted: 12.11.2024

DOI: 10.31857/S0370274X24120144

 English version: Journal of Experimental and Theoretical Physics Letters, 2024, 120:12, 879–885