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We report the first time-dependent measurements of high-molecular-weight (upto 700 amu) gas-phase oxidation products from α-pinene ozonolysis inan aerosol chamber under dry and low-NOx conditions. Measurements ofproducts having mole fractions ranging from 10−14 to 10−11 werecarried out with a chemical ionization mass spectrometer (the Cluster CIMS).Most products that were correlated with number concentrations of thesmallest particles measured (10–20 nm) had molecular weights in the 430–560 amu range. Those products are proposed to be likely responsible for theinitial nuclei formation and the early growth of the freshly nucleatedparticles based on their high molecular weights and chemical identities,both of which suggest low-volatility compounds. Another group of oxidationproducts in the lower mass range of 140–380 amu was well correlated withparticles larger than 20 nm. We postulate that those products contributed tothe later growth of particles (i.e., larger than 20 nm in diameter).Although particle nucleation in this study was primarily due to condensationof oxidation products from α-pinene ozonolysis, the involvement ofresidual sulfuric acid vapor in particle nucleation cannot be totallyexcluded

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