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How do organic vapors contribute to new-particle formation? 2013
Neil M Donahue, and
Ismael K Ortega, and
Wayne Chuang, and
Ilona Riipinen, and
Francesco Riccobono, and
Siegfried Schobesberger, and
Josef Dommen, and
Urs Baltensperger, and
Markku Kulmala, and
Douglas R Worsnop, and
Hanna Vehkamaki
Carnegie Mellon University Center for Atmospheric Particle Studies, 5000 Forbes Ave., Pittsburgh, PA, USA. nmd@andrew.cmu.edu
Highly oxidised organic vapors can effectively stabilize sulphuric acid in heteronuclear clusters and drive new-particle formation. We present quantum chemical calculations of cluster stability, showing that multifunctional species can stabilize sulphuric acid and also present additional polar functional groups for subsequent cluster growth. We also model the multi-generation oxidation of vapors associated with secondary organic aerosol formation using a two-dimensional volatility basis set. The steady-state saturation ratios and absolute concentrations of extremely low volatility products are sufficient to drive new-particle formation with sulphuric acid at atmospherically relevant rates.
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