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Journal of Physics B Atomic Molecular and Optical Physics

Angular correlations between two electrons emitted in the sequential two-photon double ionization of atoms

Грызлова Елена Владимировна, A N Grum-Grzhimailo, S. Fritzsche, N M Kabachnik

Published Oct 29, 2010• 24 citations
Publisher

Abstract

Angular correlations between two emitted photoelectrons in the sequential two-photon double ionization (TPDI) of atoms are theoretically considered. The general expression for the angular correlation function is analysed and some particular geometries of possible experiments are discussed. The concept of true angular correlations is introduced in contrast to the angular dependence of the two-electron emission from two uncorrelated ionization events. The case of a pure LS coupling description of the TPDI is considered in detail and compared with the general case. As an example, calculations of the angular correlation functions are performed and discussed for sequential TPDI from the 4p valence shell of krypton.

DOI
10.1088/0953-4075/43/22/225602

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•Jan 1, 2009•0 citations
Angular correlations between two emitted photoelectrons in the sequential two-photon double ionization (TPDI) of atoms are theoretically considered. The general expression for the angular correlation function is analysed and some particular geometries of possible experiments are discussed. The concept of true angular correlations is introduced in contrast to the angular dependence of the two-electron emission from two uncorrelated ionization events. The case of a pure LS coupling description of the TPDI is considered in detail and compared with the general case. As an example, calculations of the angular correlation functions are performed and discussed for sequential TPDI from the 4p valence shell of krypton.
The angular correlation between the photoelectron and subsequent polarized fluorescent radiation measured in coincidence is analysed theoretically for atomic photoionization. Using the density matrix and statistical tensor formalism the general expression for the correlation function is obtained for an arbitrary polarized incident photon beam. The particular geometry of a recent experiment (Beyer et al., 1995) is considered and the parameters which determine the angular correlation are expressed in terms of photoionization amplitudes. It is demonstrated that the photoelectron- (polarized) fluorescence coincidence measurements reveal strong circular and linear dichroism. As an example the photoionization of Ca atoms near the 4p 2P3/2 threshold is calculated within the framework of multichannel quantum defect theory.
Calculated results for angular distribution and angular correlation of electrons produced in the process of two-photon double ionization of Xe are presented. In particular, a peculiar dependence of the angular distribution of the second step electrons on the alignment of the intermediate ionic state is predicted. The angular correlations of the electrons qualitatively depend on the term of the residual double charged ion. The results can be used in ongoing and future experiments with free-electron laser.