Research Papers in Physics and Astronomy


Date of this Version



Published in Journal of Physics B: Atomic, Molecular and Optical Physics 40 (2007), pp. 3115– 3126; doi 10.1088/0953-4075/40/15/011 Online at Copyright © 2007 IOP Publishing Ltd. Used by permission.


An ab initio parametrization of the doubly-differential cross section (DDCS) for two-photon double ionization (TPDI) from an s2 subshell of an atom in a 1S0-state is presented. Analysis of the elliptic dichroism (ED) effect in the DDCS for TPDI of He and its comparison with the same effect in the concurrent process of sequential double ionization shows their qualitative and quantitative differences, thus providing a means to control and to distinguish sequential and non-sequential processes by measuring the relative ED parameter.

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