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Titolo:
Kinetic study of OH plus OH and OD plus OD reactions
Autore:
Bedjanian, Y; Le Bras, G; Poulet, G;
Indirizzi:
CNRS, Lab Combust & Syst Reactifs, F-45071 Orleans 2, France CNRS Orleans France 2 Combust & Syst Reactifs, F-45071 Orleans 2, France Univ Orleans, F-45071 Orleans, France Univ Orleans Orleans France F-45071 niv Orleans, F-45071 Orleans, France
Titolo Testata:
JOURNAL OF PHYSICAL CHEMISTRY A
fascicolo: 35, volume: 103, anno: 1999,
pagine: 7017 - 7025
SICI:
1089-5639(19990902)103:35<7017:KSOOPO>2.0.ZU;2-B
Fonte:
ISI
Lingua:
ENG
Soggetto:
INDUCED FLUORESCENCE MEASUREMENTS; HIGH-PRESSURE RANGE; TEMPERATURE-DEPENDENCE; RADICAL REACTIONS; GAS-PHASE; HYDROXYL RADICALS; RATE CONSTANTS; + O; H2O; HBR;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
46
Recensione:
Indirizzi per estratti:
Indirizzo: Bedjanian, Y CNRS, Lab Combust & Syst Reactifs, F-45071 Orleans 2, France CNRS Orleans France 2 t Reactifs, F-45071 Orleans 2, France
Citazione:
Y. Bedjanian et al., "Kinetic study of OH plus OH and OD plus OD reactions", J PHYS CH A, 103(35), 1999, pp. 7017-7025

Abstract

The kinetics of the disproportionation reactions of OH and OD radicals, OH+ OH --> O + H2O (1), OD + OD --> O + D2O (3), have been studied by the mass spectrometric discharge-now method at temperatures between 233 and 360 Kand at total pressure of 1 Torr of helium. The following Arrhenius expressions were obtained: k(1) = (7.1 +/- 1.0) x 10(-13) exp[(210 +/- 40)/T] and k(3) = (2.5 +/- 0.5) x 10(-13) exp[(170 +/- 60)/T] cm(3) molecule(-1) s(-1). Reaction 4 between OH and OD radicals was also investigated and the same rate constant as for reaction I was measured. Both the observed temperaturedependence of k(1) and the measured kinetic isotopic effect (k(1)/k(3)) are compatible with the mechanism proposed in a previous theoretical study (Harding, L. B.; Wagner, A. F. 22nd International Symposium on Combustion, 1988). In addition, a temperature independent rate coefficient of (1.20 +/- 0.25) x 10(-10) cm(3) moIecule(-1) s(-1) was measured for the reaction D + NO2 --> OD + NO in the temperature range 230-365 K.

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Documento generato il 21/09/20 alle ore 12:28:22