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Titolo:
Kinetic-energy release and intercharge distance of the sulfur dioxide dication (SO22+)
Autore:
Masuoka, T;
Indirizzi:
Osaka City Univ, Fac Engn, Dept Appl Phys, Sumiyoshi Ku, Osaka 5588585, Japan Osaka City Univ Osaka Japan 5588585 , Sumiyoshi Ku, Osaka 5588585, Japan
Titolo Testata:
INTERNATIONAL JOURNAL OF MASS SPECTROMETRY
fascicolo: 2-3, volume: 209, anno: 2001,
pagine: 125 - 131
SICI:
1387-3806(20010925)209:2-3<125:KRAIDO>2.0.ZU;2-G
Fonte:
ISI
Lingua:
ENG
Soggetto:
PHOTOION COINCIDENCE METHOD; DISSOCIATIVE DOUBLE PHOTOIONIZATION; DOUBLE-IONIZATION; TRIPLE-PHOTOIONIZATION; SINGLE-PHOTOIONIZATION; 3-BODY DISSOCIATIONS; IONIC FRAGMENTATION; REACTION DYNAMICS; CROSS-SECTIONS; SPECTROSCOPY;
Keywords:
kinetic-energy release; intercharge distance; fragmentation; sulfur dioxide; dication; SO22+;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
28
Recensione:
Indirizzi per estratti:
Indirizzo: Masuoka, T Osaka City Univ, Fac Engn, Dept Appl Phys, Sumiyoshi Ku, Sugimoto 3-3-138,Osaka 5588585, Japan Osaka City Univ Sugimoto 3-3-138 Osaka Japan 5588585 85, Japan
Citazione:
T. Masuoka, "Kinetic-energy release and intercharge distance of the sulfur dioxide dication (SO22+)", INT J MASS, 209(2-3), 2001, pp. 125-131

Abstract

The kinetic-energy release distributions (KERDs) of the fragment ion pairs(O+ + SO+ and O+ + S+) produced in dissociative double photoionization of sulfur dioxide have been determined by analyzing the photoion-photoion coincidence spectra measured in the energy region of 37-130 eV by use of a time-of-flight mass spectrometer and synchrotron radiation. It should be noted that the KERDs obtained for the O+ + S+ channel represent lower limits because the kinetic energy of the neutral O atom is not involved. The kinetic-energy releases (KERs) in the O+ + SO+ dissociation channel do not vary but remain almost constant across this broad range of excitation energies. Thismeans that low-lying electronic states of SO22+ below 37 eV are mainly responsible for this channel. However, the average KERs in the O+ + S+ dissociation channel depend strongly on the excitation energies in the 40-60-eV region and weakly above 60 eV. This indicates that high-lying electronic states of SO22+ as well as low-lying ones, contribute to this channel. From theobserved KERDs in the O+ + SO+ and O+ + S+ channels of SO22+, the range ofthe intercharge distances is estimated by assuming that the KERs are simply given by Coulomb repulsion. The estimated intercharge distances for the O + S+ channel are wide and deviate largely from the equilibrium internuclear distance, which is not possible by direct double ionization only and which indicates a significant role of indirect processes. (C) 2001 Elsevier Science B.V.

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Documento generato il 19/09/20 alle ore 21:35:19