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Rate constants for the gas-phase reactions of O3 with a series of Terpenes and OH radical formation from the O3 reactions with Sesquiterpenes at 296 ± 2 K

✍ Scribed by Yonghui Shu; Roger Atkinson

Publisher
John Wiley and Sons
Year
1994
Tongue
English
Weight
664 KB
Volume
26
Category
Article
ISSN
0538-8066

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✦ Synopsis

Rate constants for the gas-phase reactions of 0 3 with the sesquiterpenes a-cedrene, a-copaene, P-caryophyllene, a-humulene, and longifolene, and with the monoterpenes limonene, terpinolene, a-phellandrene, and a-terpinene, have been measured using a relative rate technique at 296 5 2 K and atmospheric pressure of air. The rate constants obtained (in units of cm3 molecule-l s-l) are: limonene, 20.1 t 5.1; terpinolene, 188 2 67; a-phellandrene, 298 f 105; a-terpinene, 2110 t 770; a-cedrene, 2.78 2 0.71; a-copaene, 15.8 2 5.6; P-caryophyllene, 1160 f 430; a-humulene, 1170 ? 450; and longifolene, <0.07, where the indicated errors include the estimated overall uncertainties in the rate constants for the reference organics. Hydroxyl radical formation yields were also determined for the 0 3 reactions with the sesquiterpenes, of 0.67 for a-cedrene, 0.35 for a-copaene, 0.06 for P-caryophyllene, and 0.22 for a-humulene, all with estimated overall uncertainties of a factor of ca. 1.5. The tropospheric lifetimes of the sesquiterpenes due to reaction with 0 3 are calculated.

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