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OH radical formation from the gas-phase reactions of O-3 with a series of terpenes

, , and . Atmospheric Environment, 36 (27): 4347--4355 (January 2002)

Abstract

The yields of OH radicals from the gas-phase reactions of 03 with a series of C-10 terpenes have been measured at 296 +/- 2K and atmospheric pressure of air, using 2-butanol to scavenge the OH radicals formed and measuring the amount of 2-butanone produced. The measured molar OH radical yields are: 2-carene, 0.81 +/- 0.11; 3-carene, 0.86 +/- 0.11; limonene, 0.67 +/- 0.10; myrcene, 0.63 +/- 0.09; ocimene (cis-/trans- mixture), 0.55 +/- 0.09; a-terpinene, 0.38 +/- 0.05; gamma-terpinene, 0.81 +/- 0.11; terpinolene, 0.74 +/- 0.10; and linalool, 0.66 +/- 0.10. These OH radical yields are independent of water vapor concentration over the range (0.34-2.7) x 10(17) molecule cm(-3) (5-40% relative humidity). Together with previous measurements in this laboratory of the OH radical yields from the reactions of O-3 with alpha-pinene and sabinene, a consistent data set of OH radical formation yields from the reactions of O-3 with monoterpenes are available for atmospheric conditions. (C) 2002 Elsevier Science Ltd. All rights reserved.

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