2003/12/17 by Peter Koval, S. Fritzsche, Stephan Fritzsche +2
Physics and Astronomy · #Atomic and Molecular Physics #Cold Atom Physics and Bose-Einstein Condensates #Laser-Matter Interactions and Applications #physics.atom-ph
paper · pdf · doi:10.1088/0953-4075/37/2/006
published as Peter Koval, Stephan Fritzsche and Andrey Surzhykov 2004 Electron angular distributions in the two-photon ionization of hydrogen-like ions: a relativistic description \textit{J. Phys. B} \textbf{37} 375-388 · 16 pages 4 figures
openalex publication_date 2003/12/17 · arxiv created 2003/12/18 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/30
The angular distribution of the emitted electrons, following the two-photon ionization of hydrogen-like ions, is studied within the framework of second order perturbation theory and the Dirac equation. Using a density matrix approach, we have investigated the effects which arise from the polarization of the incoming light as well as from the higher multipoles in the expansion of the electron–photon interaction. For medium- and high- Z ions, in particular, the non-dipole contributions give rise to a significant change in the angular distribution of the emitted electrons, if compared with the electric dipole approximation. This includes a strong forward emission while, in the dipole approximation, the electron emission always occurs symmetrically with respect to the plane which is perpendicular to the photon beam. Detailed computations for the dependence of the photoelectron angular distributions on the polarization of the incident light are carried out for the ionization of H, and Xe 53+ and U 91+ (hydrogen-like) ions.