Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 9, Issue 38, Pages 5241-5248Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/b708023a
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Following new insights on non-traditional peroxyl radical chemistry, we present an update to our earlier OH-initiated alpha-pinene degradation mechanism (Peeters et al., Phys. Chem. Chem. Phys., 2001, 3, 5489), incorporating ring closure reactions and a fast H-shift isomerization in certain key peroxyl and oxy radical intermediates. These changes, affecting only a single branch of the comprehensive mechanism and based on extensive quantum-chemical and theoretical kinetic calculations, show significant formation, similar to 20% overall, of poly-oxygenated ( hydro) peroxides in atmospheric conditions. These low-volatility compounds are expected to have a significant impact on aerosol formation, and are believed to be the high-mass product compounds observed in available experimental work. The proposed changes also affect the predicted acetone yield, matching the experimental data closely.
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