Molecular mechanism for rapid autoxidation in α-pinene ozonolysis

Parameterization of α-pinene ozonolysis SOA

Cloud Activation Potentials for Atmospheric α-Pinene and β-Caryophyllene Ozonolysis Products

The formation of atmospheric cloud droplets due to secondary organic aerosol (SOA) particles is important for quantifying the Earth's radiative balance under future, possibly warmer, climates, yet is only poorly understood. While cloud activation may be parametrized using the surface tension depression that coincides with surfactant partitioning to the gas-droplet interface, the extent to which...

Particle mass yield in secondary organic aerosol formed by the dark ozonolysis of α-pinene

The yield of particle mass in secondary organic aerosol (SOA) formed by dark ozonolysis was measured for 0.3–22.8 ppbv of reacted α-pinene. Most experiments were conducted using a continuous-flow chamber, allowing nearly constant SOA concentration and chemical composition for several days. For comparison, some experiments were also conducted in batch mode. Reaction conditions were 25C, 40% RH, ...

Dependence of particle nucleation and growth on high-molecular-weight gas-phase products during ozonolysis of α-pinene

We report the first time-dependent measurements of high-molecular-weight (up to 700 amu) gas-phase oxidation products from α-pinene ozonolysis in an aerosol chamber under dry and low-NOx conditions. Measurements of products having mole fractions ranging from 10−14 to 10−11 were carried out with a chemical ionization mass spectrometer (the Cluster CIMS). Most products that were correlated with n...

Factors controlling the evaporation of secondary organic aerosol from α‐pinene ozonolysis

Secondary organic aerosols (SOA) forms a major fraction of organic aerosols in the atmosphere. Knowledge of SOA properties that affect their dynamics in the atmosphere is needed for improving climate models. By combining experimental and modeling techniques, we investigated the factors controlling SOA evaporation under different humidity conditions. Our experiments support the conclusion of par...