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Titolo:
Low temperature measurements of the rate of association to benzene dimers in helium
Autore:
Hamon, S; Le Picard, SD; Canosa, A; Rowe, BR; Smith, IWM;
Indirizzi:
Univ Rennes 1, CNRS, UMR 6627, F-35042 Rennes, France Univ Rennes 1 Rennes France F-35042 RS, UMR 6627, F-35042 Rennes, France Univ Birmingham, Sch Chem, Birmingham B15 2TT, W Midlands, England Univ Birmingham Birmingham W Midlands England B15 2TT W Midlands, England
Titolo Testata:
JOURNAL OF CHEMICAL PHYSICS
fascicolo: 10, volume: 112, anno: 2000,
pagine: 4506 - 4516
SICI:
0021-9606(20000308)112:10<4506:LTMOTR>2.0.ZU;2-O
Fonte:
ISI
Lingua:
ENG
Soggetto:
SHOCK-TUBE FLOW; RATE CONSTANTS; HOMOGENEOUS NUCLEATION; SUPERSATURATED VAPORS; MOLECULAR-BEAMS; LAVAL NOZZLE; CLUSTERS; SPECTROSCOPY; KINETICS; CRESU;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
46
Recensione:
Indirizzi per estratti:
Indirizzo: Hamon, S Univ Rennes 1, CNRS, UMR 6627, Campus Beaulieu, F-35042 Rennes, France Univ Rennes 1 Campus Beaulieu Rennes France F-35042 nnes, France
Citazione:
S. Hamon et al., "Low temperature measurements of the rate of association to benzene dimers in helium", J CHEM PHYS, 112(10), 2000, pp. 4506-4516

Abstract

The association of benzene molecules to form dimers has been studied at temperatures between 15 and 123 K in a CRESU (Cinetique de Reactions en Ecoulement Supersonique Uniforme) apparatus with helium as the buffer gas. Second-order rate coefficients (k(2)) for the formation of dimers have been determined for temperatures between 15 and 88 K. The effective third-order ratecoefficients (no study of fall off behavior has been undertaken) obtained by dividing the values of k(2) by [He] show a strong negative temperature dependence. Further evidence for the formation of dimers at critical concentrations of benzene has been obtained from a study of the CH + C6H6 reactionand from LIF spectra. Modelling calculations indicate that any systematic errors in the results arising from the formation of higher oligomers are small. Based on a model in which it is assumed that the benzene molecules in the dimer are free to rotate, third-order rate coefficients have been calculated for dimerization and are in good agreement with the experimental values for T greater than or equal to 30 K, where effects of falloff should notbe too great. (C) 2000 American Institute of Physics. [S0021-9606(00)01710-4].

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Documento generato il 23/11/20 alle ore 21:36:14