The double photoionization of HCl: an ion-electron coincidence study

• Published in: The Journal of chemical physics Vol. 121; no. 21; p. 10508
• Main Authors: Alagia, M, Biondini, F, Brunetti, B G, Candori, P, Falcinelli, S, Moix Teixidor, M, Pirani, F, Richter, R, Stranges, S, Vecchiocattivi, F
• Format: Journal Article
• Language: English
• Published: United States 01.12.2004
• ISSN: 0021-9606; 1089-7690
• DOI: 10.1063/1.1809116

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.