Physics – Atomic Physics
Scientific paper
2003-12-18
Peter Koval, Stephan Fritzsche and Andrey Surzhykov 2004 Electron angular distributions in the two-photon ionization of hydrog
Physics
Atomic Physics
16 pages 4 figures
Scientific paper
10.1088/0953-4075/37/2/006
The angular distribution of the emitted electrons, following the two--photon ionization of the hydrogen--like ions, is studied within the framework of second order perturbation theory \textit{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 dipole approximation, the electron emission always occurs symmetric 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 the H, Xe$^{53+}$ and U$^{91+}$ (hydrogen--like) ions.
Fritzsche Stephan
Koval Peter
Surzhykov Andrey
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