Abstract
The formation of secondary organic aerosol (SOA) from α-pinene ozonolysis has been widely studied, with a recent focus on contributions from highly oxidized multifunctional compounds (HOMs) that have been observed in laboratory and field studies. Most of what is known about the chemical composition of SOA and HOMs, however, consists of molecular formulas and limited molecular structure identification based on mass spectrometric analysis. Here, we characterized the SOA formed from α-pinene ozonolysis using derivatization-spectrophotometric methods to quantify peroxide, carbonyl, carboxyl, ester, and hydroxyl groups. Experiments were conducted over a range of α-pinene concentrations and relative humidities, including regimes in which gas-phase HOMs were detected using NO3– chemical ionization mass spectrometry. Results for experiments conducted with high concentrations of α-pinene were also compared with predictions of a model that employed the Master Chemical Mechanism and included gas-particle and gas-wal...
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