Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Kinetic studies of OH-initiated reactions of isoprene
Autore:
Zhang, RY; Suh, I; Lei, W; Clinkenbeard, AD; North, SW;
Indirizzi:
Texas A&M Univ, Dept Atmospher Sci, College Stn, TX 77843 USA Texas A&M Univ College Stn TX USA 77843 er Sci, College Stn, TX 77843 USA Texas A&M Univ, Dept Chem, College Stn, TX 77842 USA Texas A&M Univ College Stn TX USA 77842 t Chem, College Stn, TX 77842 USA
Titolo Testata:
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
fascicolo: D20, volume: 105, anno: 2000,
pagine: 24627 - 24635
Fonte:
ISI
Lingua:
ENG
Soggetto:
GAS-PHASE REACTION; ATMOSPHERIC PHOTOOXIDATION; NATURAL HYDROCARBONS; RATE CONSTANTS; OXIDATION; MECHANISM; RADICALS; PRODUCTS; OXYGEN; OZONE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
38
Recensione:
Indirizzi per estratti:
Indirizzo: Zhang, RY Texas A&M Univ, Dept Atmospher Sci, 1204 Eller O&M Bldg, CollegeStn, TX 77843 USA Texas A&M Univ 1204 Eller O&M Bldg College Stn TX USA 77843 USA
Citazione:
R.Y. Zhang et al., "Kinetic studies of OH-initiated reactions of isoprene", J GEO RES-A, 105(D20), 2000, pp. 24627-24635

Abstract

We report laboratory kinetic studies of isoprene reactions initiated by the hydroxyl radical OH, using a turbulent flow reactor coupled to chemical ionization mass spectrometry (CIMS) detection. The rate constants for the reaction of isoprene with OH have been measured in the pressure range of 70 to 120 torr at 298 +/- 2 K and are found to be independent of pressure with an averaged value of (10.1 +/- 0.8) x 10(-11) cm(3) molecule(-1) s(-1). Theerror limit given is within 1 standard deviation; a systematic error is estimated to be +/-15%. We also describe direct observation of the OH-isoprene adduct based on ion-molecule reactions by using the CIMS method. The formation of the OH-isoprene adduct was used to extract the rate constant between OH and isoprene; within the uncertainty of the experiments the results were consistent with those obtained from the observed disappearance of OH. By monitoring the formation of the OH-isoprene adduct in the presence of oxygen molecules, an overall rate constant between OH-isoprene adduct and O-2 has been first determined, with an averaged value of (2.8 +/- 0.7) x 10(-15) cm(3) molecule(-1) s(-1) at 76 torr and an estimated systematic error of /-50%. Atmospheric implications of the present results to the photochemical oxidation of isoprene are discussed.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 29/03/20 alle ore 17:07:21