| Abstract
| - Aliphatic straight-chain dicarboxylic acids have beenidentified as common water-soluble organic componentsof atmospheric aerosols. To model the partitioning of suchcompounds between gas and particle phase in theatmosphere, information about their vapor pressures isessential. In this work, vapor pressures of C3−C9 dicarboxylicacids are derived from measured evaporation rates ofsubmicron aerosols over the temperature range of 290−314 K using the tandem differential mobility analyzer technique.Vapor pressures obtained from the experimental datawere as follows: log(, Pa) = − 4822 K/T + 12.9,log(, Pa) = − 7196.8 K/T + 19.8,(296 K) =6.7 × 10-4 Pa, log(, Pa) = −8065.0 K/T + 22.2,log(, Pa) = −7692.8 K/T + 21.8, log(, Pa) =−9629.4 K/T + 26.5, and log(, Pa) = −7968.7 K/T+ 21.7. Vapor pressures of C3−C9 dicarboxylic acids areshown to alternate strongly with the parity of the numberof carbon atoms. Higher vapor pressures of the odd acidsfit the less stable crystal structure, the propensity ofpolymorphism in the odd acids, and the evolution of meltingtemperatures. Results are compared with availableliterature data.
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