Table 1. Experimental Conditions and Results Exp. No. Isoprene, ppb Seed Volume, mum3/cm3 a [NO]0, ppb [NO2]0, ppbb [NOx]max, ppbb [O3]max, ppb T, degreesCc RHc SOA Volume, mum3/cm3 a SOA Yieldd 1 500 11.0 +/- 0.7 138 124 280 n.m.e 20.3 43.90% 30.4 +/- 2.0 3.00% 2 250 10.0 +/- 0.6 85 147 242 70 20.1 42.40% 11.9 +/- 1.2 2.30% 3 100 14.8 +/- 0.6 85 136 240 4 19.9 47.30% 4.4 +/- 0.8 2.20% 4 50 17.4 +/- 1.0 100 98 213 10 20.8 46.60% 0.9 +/- 1.6 0.90% 5 25 12.2 +/- 0.9 87 102 202 25 20.9 41.10% 0.5 +/- 1.3 1.10% 6 175 17.1 +/- 1.3 107 120 240 119 20.2 44.20% 5.5 +/- 2.1 2.10% 7 375 25.6 +/- 0.9 ?107 f ?120 f 239 213 20.5 49.50% 16.3 +/- 1.7 1.60% 8 75 17.4 +/- 0.8 75 165 255 32 21.9 48.10% 2.3 +/- 1.3 1.50% 9 60 13.2 +/- 0.7 83 139 249 24 21.2 43.10% 1.5 +/- 1.4 1.20% aStated uncertainties (2sigma) are from noise in the DMA measurements. bMay include contribution from HONO. cAveraged over the course of the experiment. dAssuming a density of 1.4 g/cm3. eNot measured. fAccurate initial values of NOx were not obtained for this experiment but are expected to be similar to those of Expt. 6.