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

Cavity ring-down spectroscopy is applied 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+CH3l is determined to be (4.1plus over minus 0.2)*10(super -13) cm(super 3) molecule(super -1) s(super -1) in 100 Torr of N2 diluent at 298 K and is pressure-independent.