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Triple-differential cross-sections for two-photon double ionization of He near threshold

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S X Hu, J Colgan and L A Collins

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LETTER TO THE EDITOR

Complete two-photon break-up of He near threshold has been investigated by solving the time-dependent closing-coupling equations on a numerical lattice. We have obtained good agreement for the total double ionization cross-section with previous theoretical results. The triple-differential cross-sections exhibit interesting features as the two-photon energy approaches the threshold of double ionization. We found that two-electron ejection with equal energy sharing is most probable near the two-photon threshold, in contrast to the case away from threshold, where ejection with large unequal energy sharings is most probable.


PACS

32.80.Fb Photoionization of atoms and ions

Subjects

Atomic and molecular physics

Dates

Issue 1 (14 January 2005)

Received 20 October 2004

Published 17 December 2004



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