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Rate constants for the gas-phase reactions of the OH radical with a series of monoterpenes at 294 ± 1 K

✍ Scribed by Roger Atkinson; Sara M. Aschmann; James N. Pitts Jr.

Publisher
John Wiley and Sons
Year
1986
Tongue
English
Weight
593 KB
Volume
18
Category
Article
ISSN
0538-8066

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✦ Synopsis

Using a relative rate technique, rate constants for the gas-phase reactions of the OH radical with a series of monoterpenes have been determined in one atmosphere of air at 294 5 1 K. Relative to a rate constant for the reaction of OH radicals with 2,3-dimethyl-2-butene of 1.12 lo-'' cm3 molecule-' sec-', the rate constants obtained were (in units of lo-" cm3 molecule-' sec-'1: a-pinene, 5.45 ? 0.32; P-pinene, 7.95 * 0.52; A3-carene, 8.70 5 0.43; d-limonene, 16.9 ? 0.5; a-terpinene, 36.0 t 4.0; y-terpinene, 17.6 1.8; a-phellandrene, 31.0 ? 7.1; myrcene, 21.3 ? 1.6; and ocimene (a cis-, trans-mixture), 25.0 2 1.9. These are the first quantitative kinetic data reported for many of these monoterpenes. The rate constants obtained are compared with the available literature data and with a priori estimates based on the number and configuration of substituents around the double bond(s). The tropospheric lifetimes of these monoterpenes with OH radicals, NO, radicals and O3 are estimated and compared. Atmospheric lifetimes with respect to reaction with the OH radical are calculated to range from -0.75 hr for a-terpinene to -5 hr for a-pinene.

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