Photodetachment of He^– near the 1s threshold: Absolute cross-section measurements and postcollision interactions

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R. C. Bilodeau,^1,2 J. D. Bozek,² G. D. Ackerman,² A. Aguilar,^2,3 and N. Berrah¹
¹Physics Department, Western Michigan University, Kalamazoo, Michigan 49008-5151, USA
²Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
³Department of Physics, University of Nevada, Reno, Nevada 89557-0058, USA

Received 31 October 2005; published 6 March 2006

Inner-shellphotodetachment of He^– is studied near the He^– 1s2s2p ⁴P^o --> He 2s2p ³P^o threshold. Thespectrum over this region shows significant suppression of He⁺ signalproduction due to postcollision interaction (PCI) effects. The observed shapeand absolute cross section are in general agreement with theoreticalpredictions when corrections for semiclassical PCI effects are included.

URL:	http://link.aps.org/doi/10.1103/PhysRevA.73.034701
DOI:	10.1103/PhysRevA.73.034701
PACS:	32.80.Gc; 32.80.Hd; 32.30.Jc 32.80.Gc Photodetachment of atomic negative ions 32.80.Hd Auger effect and inner-shell atomic excitation or ionization 32.30.Jc Visible and ultraviolet atomic spectra YEAR: 2006
KEYWORDS:	helium ions, atom-photon collisions, electron detachment, inner-shell ionisation, negative ions, ultraviolet spectra, visible spectra

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