title: The double photoionization of HCl: an ion-electron coincidence study.
abstract: The double photoionization of HCl molecules by synchrotron radiation has been studied in the energy range between 30 and 50 eV. The HCl(2+) and Cl(2+) product ions have been detected by a photoelectron-photoion-coincidence technique, while the H(+)+Cl(+) formation, which follows the double ionization of HCl, has been studied by photoelectron-photoion-photoion coincidence. The photon energy threshold for the production of HCl(2+) ions has been found to be 35.4+/-0.6 eV, while for the dissociative channel leading to H(+)+Cl(+), it has been measured a threshold at 36.4+/-0.6 eV and a change in the slope of the cross-section energy dependence at 38.7+/-0.7 eV. The production of H+Cl(2+) occurs with a threshold photon energy of 42.8+/-1.1 eV. These results appear to be in a good agreement with previous data by different experimental techniques and recent theoretical calculations performed by our laboratory.
authors.affiliation: ISMN-CNR Sezione Roma 1, Piazzale A. Moro 5, 00185 Rome, Italy.
authors.forename: M
authors.initials: M
authors.lastname: Alagia
authors.forename: F
authors.initials: F
authors.lastname: Biondini
authors.forename: B G
authors.initials: BG
authors.lastname: Brunetti
authors.forename: P
authors.initials: P
authors.lastname: Candori
authors.forename: S
authors.initials: S
authors.lastname: Falcinelli
authors.forename: M
authors.initials: M
authors.lastname: Moix Teixidor
authors.forename: F
authors.initials: F
authors.lastname: Pirani
authors.forename: R
authors.initials: R
authors.lastname: Richter
authors.forename: S
authors.initials: S
authors.lastname: Stranges
authors.forename: F
authors.initials: F
authors.lastname: Vecchiocattivi