Abstract
An expression for the angular correlation function of the two photoelectrons in the sequential two-photon double ionization (TPDI) of atoms is derived, which can be used for analyzing angle-resolved coincidence experiments. Making use of this expression, we have calculated in particular the cross sections, angular distributions and angular correlation functions for the TPDI of Ne, Ar and Kr atoms. The results are compared with recent experiments from the free-electron laser (FLASH) facility as far as available.
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