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Titolo:
Branching ratios for competing channels in the reaction of HOCO radicals with NO
Autore:
Olkhov, RV; Li, Q; Osborne, MC; Smith, IWM;
Indirizzi:
Univ Birmingham, Sch Chem, Birmingham B15 2TT, W Midlands, England Univ Birmingham Birmingham W Midlands England B15 2TT W Midlands, England
Titolo Testata:
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
fascicolo: 20, volume: 3, anno: 2001,
pagine: 4522 - 4528
SICI:
1463-9076(2001)3:20<4522:BRFCCI>2.0.ZU;2-G
Fonte:
ISI
Lingua:
ENG
Soggetto:
HIGH-PRESSURE RANGE; INDUCED FLUORESCENCE MEASUREMENTS; TRANS-HOCO; ATMOSPHERIC CHEMISTRY; GAS-PHASE; OH; KINETICS; SPECTRUM; CO; SPECTROSCOPY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
30
Recensione:
Indirizzi per estratti:
Indirizzo: Smith, IWM Univ Birmingham, Sch Chem, POB 363, Birmingham B15 2TT, W Midlands, England Univ Birmingham POB 363 Birmingham W Midlands England B15 2TT d
Citazione:
R.V. Olkhov et al., "Branching ratios for competing channels in the reaction of HOCO radicals with NO", PHYS CHEM P, 3(20), 2001, pp. 4522-4528

Abstract

The yields of CO2 from the reactions of HOCO radicals with O-2 and with NOhave been compared using the technique of time-resolved infrared absorption. In two separate series of experiments, HOCO radicals have been generatedby (i) broadband ultraviolet photolysis of acrylic acid (CH2CHCOOH) and (ii) the reaction, Cl+HCOOH --> HCl + HOCO, following pulsed laser photolysisof Cl-2 at 351 nm. In the latter experiments, the observed CO2 yields werecorrected for the loss of Cl atoms by the reactions Cl+NO+He --> ClNO+He and Cl + ClNO --> Cl-2 + NO. Our measurements on the rate of Cl+NO+He yield a value of the third-order rate constant of (5.1 +/- 0.7) x 10(-32) cm(6) molecule(-2) s(-1). The results of the main experiments show that the yield of CO2 from the reaction between NO+HOCO is appreciably less than that fromO-2 + HOCO and is dependent on the total pressure in the range 10 to 100 Torr. We interpret this as showing that the reactions and HOCO + NO --> HNO CO2 and HOCO+NO(+M) --> HOC(O)NO(+M) occur at similar rates, with the latter reaction being favoured at the higher total pressure.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 12/08/20 alle ore 20:55:36