Temperature dependence of CH 2 (ã 1A 1) removal rates by Ar, NO and H 2

Abstract

Absolute rate constants for the removal of CH 2 (ã 1A 1) by Ar, NO and H 2 have been measured over the temperature range 295–431 K using laser flash kinetic absorption spectroscopy. For NO and H 2, no marked temperature dependence is observed. For Ar, the rate constants increase by some 50% over this range and the results are discussed in terms of a theoretical model which relates the removal rate constants to the fractional population of CH 2 (ã 1A 1) in states perturbed by nearby triplet levels.