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| - Experimental Study of NO Reaction with Isoprene Hydroxyalkyl Peroxy Radicals
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| - Despite the importance of isoprene hydroxy peroxy radicals (RO2) in the conversion of NO to NO2 andhence in tropospheric ozone formation, no direct experimental studies have been carried out to investigatethe kinetics of the RO2−NO reaction. We report the first direct laboratory study of the rate constant for theisoprene RO2−NO reaction using a fast-flow reactor coupled to chemical ionization mass spectrometry (CIMS)detection. By directly monitoring the peroxy radical, a rate constant of (9 ± 3) × 10-12 cm3 molecule-1 s-1was determined in the pressure range of 1 to 2 Torr and at a temperature of 298 ± 2 K. The measured rateconstant is compared to the results of a recent theoretical prediction and indirect measurements and implicationsfor the atmosphere are discussed.
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