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The influence of water and radicals on SOAs produced by {\beta}-pineneozonolysis was investigated at 298 and 288 K using a laminar flow reactor. Avolatility tandem differential mobility analyzer (VTDMA) was used to measurethe evaporation of the SOA, enabling the parameterization of its volatilityproperties. The parameters extracted included the temperature at which 50% ofthe aerosol had evaporated (TVFR0.5) and the slope factor (SVFR). An increasein SVFR indicates a broader distribution of vapor pressures for the aerosolconstituents. Reducing the reaction temperature increased SVFR and decreasedTVFR0.5 under humid conditions but had less effect on TVFR0.5 under dryconditions. In general, higher water concentrations gave lower TVFR0.5 values,more negative SVFR values, and a reduction in total SOA production. The radicalconditions were changed by introducing OH scavengers to generate systems withand without OH radicals and with different [HO2]/[RO2] ratios. Presence of ascavenger and lower [HO2]/[RO2] ratio reduced SOA production. Observed changesin SVFR values could be linked to the more complex chemistry that occurs in theabsence of a scavenger, and indicated that additional HO2 chemistry givesproducts with a wider range of vapor pressures. Updates to existing ozonolysismechanisms with routes that describe the observed responses to water andradical conditions for monoterpenes with endocyclic and exocyclic double bondsare discussed.

the journal of physical chemistry. a/the journal of physical chemistry. a.

Influence of Humidity, Temperature and Radicals on the Formation and  Thermal Properties of Secondary Organic Aerosol (SOA) from Ozonolysis of  {\beta}-pinene