The kinetics of the reactions of Cl-, O-, and O2- with HNO3: Implications for measurement of HNO3 in the atmosphere

摘要

The rate coefficients for the reactions of O-, Cl-, and O2- with HNO3 were measured to be (3.6 ± 0.9), (2.8 ± 0.7), and (2.9 ± 0.8) × 10-9 cm3 molecule-1 s-1, respectively, at 295 K using the flowing afterglow technique. NO3- was the only product ion identified for each of these reactions. The measured rate coefficients for the O- and Cl- reactions are larger than previously reported. The implications of these results for active chemical ionization mass spectrometry (ACIMS) measurements of HNO3 in the upper atmosphere are discussed.