REACTIONS OF NO3-NAPHTHALENE ADDUCTS WITH O2 AND NO2

The kinetics of the gas-phase reaction of the NO3 radical with naphtha lene have been investigated at 150 torr O2 + 590 torr N2 and 600 torr O2 + 140 torr N2 at 298 +/- 2 K. Relative rate measurements were carri ed out in reacting NO3-N2O5-naphthalene-propene-O2-N2 Mixtures by long path Fourier transform infrared absorption spectroscopy. A rate consta nt ratio for the reactions of O2 and NO2 with the NO3-naphthalene addu ct of k(O2)/k(NO2) < 4 x 10(-7) Was obtained from the competition betw een O2 and NO2 for reaction with the NO3-naphthalene adduct and therma l decomposition of the adduct back to reactants. Atmospheric pressure ionization MS/MS measurements of the nitronaphthalene products of the NO3 radical-initiated reaction of naphthalene are consistent with the proposed reaction mechanism, and the atmospheric implications of the d ata are discussed. (C) 1994 John Wiley & Sons, Inc.