J. Phys. IV France 09 (1999) Pr6-1-Pr6-4
Complete (γ,2e) experiments at 0.1 eV above thresholdF. Rond, J. Mazeau and A. Huetz
Laboratoire de Spectroscopie Atomique et Ionique, Université Paris Sud, bâtiment 350, Centre d'Orsay, 91405 Orsay cedex, France
Here we report on a new experiment which has been designed to perform (γ,2e) experiments extremely close to threshold, in an energy range which is inaccessible to conventional electron analysers. The angular and energy resolutions of this new technique are illustrated by measuring electrons issued from resonant single ionization of argon. First results on double ionization of argon for the 3p4 3Pe J=2 final state of Ar++ are also presented. The contribution of an indirect process producing 20 meV Auger electrons, which was suspected from previous experiments, is clearly observed in addition to the direct process.
© EDP Sciences 1999