Abstract
Vapor pressures of five methyl-substituted dicarboxylic acids are inferred from measurements of evaporation rates of sub-micron particles using the TDMA technique at ambient temperatures. Vapor pressures obtained are: log ( p methyl - malonic 0 / Pa ) = - 5538 K / T + 15.5 , log ( p dimethyl - malonic 0 / Pa ) = - 6195 K / T + 17.2 , log ( p 2 - methyl - succinic 0 / Pa ) = - 4800 K / T + 13.3 , log ( p 2 , 2 - dimethyl - succinic 0 / Pa ) = - 3515 K / T + 9.0 , log ( p 3 - methyl - glutaric 0 / Pa ) = - 3173 K / T + 7.5 , log ( p 3 , 3 - dimethyl - glutaric 0 / Pa ) = - 3138 K / T + 7.6 , log ( p 3 - methyl - adipic 0 / Pa ) = - 11227 K / T + 33.8 . These vapor pressures are compared with available literature data and with vapor pressures of the un-substituted acids. Our results demonstrate that molecular structure is important for solid state vapor pressures of secondary organic aerosol components at ambient conditions.
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