Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Electron-impact ionization of hydrogen chloride
Autore:
Harper, S; Calandra, P; Price, SD;
Indirizzi:
Univ London Univ Coll, Dept Chem, London WC1H 0AJ, England Univ London Univ Coll London England WC1H 0AJ , London WC1H 0AJ, England
Titolo Testata:
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
fascicolo: 5, volume: 3, anno: 2001,
pagine: 741 - 749
SICI:
1463-9076(2001)3:5<741:EIOHC>2.0.ZU;2-V
Fonte:
ISI
Lingua:
ENG
Soggetto:
DOUBLY-CHARGED IONS; TRIPLE COINCIDENCE TECHNIQUE; PHOTON DOUBLE-IONIZATION; OF-FLIGHT METHOD; CROSS-SECTIONS; DOUBLE PHOTOIONIZATION; DISSOCIATIVE IONIZATION; 3-BODY DISSOCIATIONS; INFRARED-SPECTRUM; MASS-SPECTROSCOPY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
60
Recensione:
Indirizzi per estratti:
Indirizzo: Harper, S Univ London Univ Coll, Dept Chem, 20 Gordon St, London WC1H 0AJ,England Univ London Univ Coll 20 Gordon St London England WC1H 0AJ land
Citazione:
S. Harper et al., "Electron-impact ionization of hydrogen chloride", PHYS CHEM P, 3(5), 2001, pp. 741-749

Abstract

Relative partial ionization cross sections for the formation of Cl+, Cl2+ and H+ from the hydrogen chloride molecule have been determined, from simultaneously recorded mass and two-dimensional ion-ion coincidence spectra, asa function of the ionizing electron energy from 30 to 200 eV. Precursor specific cross sections have been derived which quantify the contribution to the yield of each fragment ion from each level of ionization and the kinetic energy released in the fragmentation reactions of multiply charged HCl has been used to obtain thermodynamic information on the doubly and triply charged states. Analysis shows that at 100 eV electron energy double ionization contributes 12% of the total ion yield and 3% at 50 eV. At 100 eV the decay of HCl2+ by the loss of an H atom to form Cl2+ is a result of approximately 41% of the double ionization events, comparable to the frequency of charge separating dissociation (52%). The formation of Cl2+ has a threshold of 46.8 +/- 1.5 eV and is assigned to population of the c (5)Sigma (-) dication state. The observed threshold for forming long-lived dications (HCl2+) is consistent with the population of the ground state of the dication, and higher vibrational levels of this state appear to contribute to the yield of H+ + Cl+ ion pairs. The formation of metastable HCl2+ contributes a maximum of 0.6% to the ion yield. Long-lived HCl3+ ions are not detected but dissociative triple ionization makes up approximately 0.7% of the ion yield at200 eV. We estimate the lowest lying dissociative state of HCl3+ lies at 72 +/- 2 eV above the ground state of the neutral molecule.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 23/09/20 alle ore 00:23:27