Doubly Excited States in Helium Close to the Double Ionization Threshold: Angular and Energy Resolved Partial Cross Sections

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Published under licence by IOP Publishing Ltd
, , Citation A Czasch et al 2004 Phys. Scr. 2004 141 DOI 10.1238/Physica.Topical.110a00141

1402-4896/2004/T110/141

Abstract

This is a report about a novel experiment on double excitation of Helium by absorption of synchrotron radiation close to the double ionization threshold at 79 eV. Partial cross-sections for single-ionization from 78.15 eV up to 78.9 eV (photon energy) with an energy resolution of 3 meV have been measured. The technique described in this article allows for an angular and energy resolved measurement of low energy electrons with a high detection efficiency due to an angular acceptance of 4π solid angle.

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10.1238/Physica.Topical.110a00141