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The Pasadena Aerosol Characterization Observatory (PACO) represents the first major aerosol characterization experiment centered in the Western/Central Los Angeles Basin. The sampling site, located on the campus of the Cal-ifornia Institute of Technology in Pasadena, was positioned to sample a continuous afternoon influx of transported urban aerosol with a(More)
Long-chain alkanes, which can be categorized as intermediate volatility organic compounds, are an important source of secondary organic aerosol (SOA). Mechanisms for the gas-phase OH-initiated oxidation of long-chain alkanes have been well documented; particle-phase chemistry, however , has received less attention. The δ-hydroxycarbonyl, which is generated(More)
The secondary organic aerosol (SOA) formation from four C 12 alkanes (n-dodecane, 2-methylundecane, hexylcyclohexane, and cyclododecane) is studied in the Cal-tech Environmental Chamber under low-NO x conditions, in which the principal fate of the peroxy radical formed in the initial OH reaction is reaction with HO 2. Simultaneous gas-and particle-phase(More)
We describe the products of the reaction of the hydroperoxy radical (HO(2)) with the alkylperoxy radical formed following addition of the nitrate radical (NO(3)) and O(2) to isoprene. NO(3) adds preferentially to the C(1) position of isoprene (>6 times more favorably than addition to C(4)), followed by the addition of O(2) to produce a suite of nitrooxy(More)
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