Berlin 2001 – scientific programme
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MO: Molekülphysik
MO 6: Dissociation and other Collision Processes
MO 6.10: Talk
Tuesday, April 3, 2001, 18:15–18:30, H1058
IONIZATION OF WATER VAPOR BY 20-150 KEV PROTONS : DIRECT IONIZATION AND ELECTRON CAPTURE — •FARIZON Michel1, GOBET FRANCK1, FARIZON BERNADETTE1, GAILLARD MICHEL-JEAN1, CARRE MICHEL2, LEZIUS MARTIN3, SCHEIER PAUL3, and MAERK TILMANN3 — 1Institut de Physique Nucleaire, 43 boulevard du 11 Novembre 1918, F69622 VILLEURNANNE — 2Laboratoire de spectrometrie ionique et moleculaire, 43 boulevard du 11 Novembre 1918, F69622 VILLEURBANNE — 3Institut fur ionenphysik, Leopold Franzens Universitat, Technikerstr. 25, A-6020 INNSBRUCK
We present experimental results for proton ionization of water molecules based on a novel event by event analysis of the different ions produced (and lost). We are able to obtain mass analyzed product ion signals (e. g. H2O+, OH+, O+, O++, H+) in coincidence with the projectile analyzed after the collision, i.e., either being H+ or neutral H after a single electron capture during the ionization event and H- after double electron capture. After a proper calibration we are thus able to determine a complete set of cross sections for the ionization of a molecular target by protons including the total and the partial cross sections and in addition also the direct ionization and electron capture cross sections.