| Abstract
| - The semivolatile oxidation products (trans-norpinic acid,pinic acid, cis-pinonic acid, etc.) of the biogenic monoterpenes(α-pinene, β-pinene, etc.) contribute to the atmosphericburden of particulate matter. Using the tandem differentialmobility analysis (TDMA) technique evaporation rates ofglutaric acid, trans-norpinic acid, and pinic acid particleswere measured in a laminar flow reactor. The vaporpressure of glutaric acid was found to be log(p0glutaric/Pa)= − 3510 K/T + 8.647 over the temperature range 290−300 K in good agreement with the values previouslyreported by Tao and McMurry (1989). The measured vaporpressure of trans-norpinic acid over the temperaturerange 290−312 K is log(p0norpinic/Pa) = − 2196.9 K/T +3.522, and the vapor pressure of pinic acid is log(p0pinic/Pa) = − 5691.7 K/T + 14.73 over the temperature range 290−323 K. The uncertainty on the reported vapor pressuresis estimated to be approximately ± 50%. The vapor pressureof cis-pinonic acid is estimated to be of the order of 7× 10-5 Pa at 296 K.
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