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The reaction of isoprene (C5H8) with hydroxyl radicals has beenstudied in the absence of nitrogen oxides (NOx) to determine physicaland chemical characteristics of the secondary organic aerosol formed.Experiments were conducted using a smog chamber operated in a steady-statemode permitting measurements of moderately low aerosol levels. GC-MS analysiswas conducted to measure methyl butenediols in the gas phase andpolyols in the aerosol phase. Analyses were made to obtain several bulkaerosol parameters from the reaction including values for the organic massto organic carbon ratio, the effective enthalpy of vaporization(ΔHvapeff), organic peroxide fraction, and the aerosol yield. The gas phase analysis showed the presence of methacrolein, methyl vinylketone, and four isomers of the methyl butenediols. These gas-phasecompounds may serve as precursors for one or more of several compoundsdetected in the aerosol phase including 2-methylglyceric acid, three2-methyl alkenetriols, and two 2-methyl tetrols. In contrast to mostprevious studies, the 2-methyl tetrols (and the 2-methyl alkenetriols) werefound to form in the absence of acidic sulfate aerosol. However, reactionconditions did not favor the production of HO2 radicals, thus allowingRO2+RO2 reactions to proceed more readily than if higherHO2 levels had been generated. SOA/SOC (i.e. OM/OC) was found to average 1.9 in the absence of NOx.The effective enthalpy of vaporization was measured as 38.6 kJ mol−1,consistent with values used previously in modeling studies. The yields inthis work (using an independent technique than used previously) are lower thanthose of Kroll et al. (2006) for similar aerosol masses. SOC yields reportedin this work range from 0.5–1.4% for carbon masses between 17 and49 μgC m−3

The formation of secondary organic aerosol from the isoprene + OH reaction in the absence of NO&lt;sub&gt;x&lt;/sub&gt;

The formation of secondary organic aerosol from the isoprene + OH reaction in the absence of NO<sub>x</sub>