TY - JOUR
T1 - Kinetics of the OH-initiated oxidation of isoprene
AU - Campuzano-Jost, Pedro
AU - Williams, Margaret B.
AU - D'Ottone, Luca
AU - Hynes, Anthony J.
PY - 2000/3/1
Y1 - 2000/3/1
N2 - Absolute rate coefficients have been determined for the reaction OH + C5H8 (1) and two of its isotopomeric variants. Reaction (1) was studied as a function of temperature and pressure in N2, N2/O2 and He buffer gases. At room temperature, a rate coefficient, k1, of (8.56±0.26)*10−11 cm3 s−1 independent of pressure and buffer gas identity was obtained. An Arrhenius fit to data over the temperature range 250 - 340 K gave a negative activation energy of -666±150 cal/mol. HO2 production was inferred from observations of radical regeneration in the presence of NO. The absence of a kinetic isotope effect, together with the specificity of radical regeneration, indicates that reaction proceeds via an addition channel with no significant abstraction component. Our rate coefficient for reaction (1) is 15% lower than the value currently recommenced for atmospheric modeling.
AB - Absolute rate coefficients have been determined for the reaction OH + C5H8 (1) and two of its isotopomeric variants. Reaction (1) was studied as a function of temperature and pressure in N2, N2/O2 and He buffer gases. At room temperature, a rate coefficient, k1, of (8.56±0.26)*10−11 cm3 s−1 independent of pressure and buffer gas identity was obtained. An Arrhenius fit to data over the temperature range 250 - 340 K gave a negative activation energy of -666±150 cal/mol. HO2 production was inferred from observations of radical regeneration in the presence of NO. The absence of a kinetic isotope effect, together with the specificity of radical regeneration, indicates that reaction proceeds via an addition channel with no significant abstraction component. Our rate coefficient for reaction (1) is 15% lower than the value currently recommenced for atmospheric modeling.
UR - http://www.scopus.com/inward/record.url?scp=0034353382&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0034353382&partnerID=8YFLogxK
U2 - 10.1029/1999GL010995
DO - 10.1029/1999GL010995
M3 - Article
AN - SCOPUS:0034353382
VL - 27
SP - 693
EP - 696
JO - Geophysical Research Letters
JF - Geophysical Research Letters
SN - 0094-8276
IS - 5
ER -