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Rate coefficients for the reactions of OH with n ‐propanol and iso ‐propanol between 237 and 376 K
Author(s) -
Rajakumar B.,
McCabe David C.,
Talukdar Ranajit K.,
Ravishankara A. R.
Publication year - 2010
Publication title -
international journal of chemical kinetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.341
H-Index - 68
eISSN - 1097-4601
pISSN - 0538-8066
DOI - 10.1002/kin.20456
Subject(s) - chemistry , propanol , 1 propanol , thermodynamics , medicinal chemistry , organic chemistry , methanol , physics
The rate coefficients for the reaction OH + CH 3 CH 2 CH 2 OH → products ( k 1 ) and OH + CH 3 CH(OH)CH 3 → products ( k 2 ) were measured by the pulsed‐laser photolysis–laser‐induced fluorescence technique between 237 and 376 K. Arrhenius expressions for k 1 and k 2 are as follows: k 1 = (6.2 ± 0.8) × 10 −12 exp[−(10 ± 30)/T] cm 3 molecule −1 s −1 , with k 1 (298 K) = (5.90 ± 0.56) × 10 −12 cm 3 molecule −1 s −1 , and k 2 = (3.2 ± 0.3) × 10 −12 exp[(150 ± 20)/T] cm 3 molecule −1 s −1 , with k 2 (298) = (5.22 ± 0.46) × 10 −12 cm 3 molecule −1 s −1 . The quoted uncertainties are at the 95% confidence level and include estimated systematic errors. The results are compared with those from previous measurements and rate coefficient expressions for atmospheric modeling are recommended. The absorption cross sections for n ‐propanol and iso ‐propanol at 184.9 nm were measured to be (8.89 ± 0.44) × 10 −19 and (1.90 ± 0.10) × 10 −18 cm 2 molecule −1 , respectively. The atmospheric implications of the degradation of n ‐propanol and iso ‐propanol are discussed. © 2009 Wiley Periodicals, Inc. Int J Chem Kinet 42: 10–24, 2010