Research Papers in Physics and Astronomy


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Published in Journal of Physics B: Atomic, Molecular and Optical Physics 35:24 (December 28, 2002), pp. L543–L552. Copyright © 2002 IOP Publishing Ltd. Used by permission.


Single-photon, two-electron ionization of He is analyzed, taking into account electron correlation using lowest-order perturbation theory and including all individual electron angular momenta in the final two-electron continuum. Perturbative account of electron correlation in the final state, which describes the so-called TS-1 mechanism of double photoionization, combined with a variational account of electron screening, is found to provide results for the triply differential cross section at an excess energy of 20 eV that are in excellent agreement with both absolute experimental data and results of non-perturbative calculations, for all kinematics of the process in which the TS-1 mechanism is expected to dominate.

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