Rate constants of the reaction of NO3 with CH3I measured with use of cavity ring-down spectroscopy

Abstract

We have applied cavity ring-down spectroscopy to a kinetic study of the reaction of NO3 with CH3I in 20-200 Torr of N2 diluent at 298 K. The rate constant of the reaction of NO3 + CH 3I was determined to be (4.1 ± 0.2) × 10-13 cm3 molecule-1 s-1 in 100 Torr of N2 diluent at 298 K and is pressure-independent. This reaction may significantly contribute to the formation of reactive iodine compounds in the atmosphere. © 2005 American Chemical Society.