Collisional Quenching of CH3O(A2A1)

Article abstract of DOI:10.1021/j100296a030

Room temperature rate constants for collisional quenching of CH3O(A²A₁) have been measured for 20 collision partners.Methoxy radicals are produced by 248-nm photolysis of CH3ONO and the CH3O(A²A₁) is produced by exciting the A-X transition using a pulsed dye laser.Rate constants are determined by monitoring the time-resolved fluorescence signal as a function of quenching gas pressure.The experimental quenching cross sections are best correlated in terms of the CH3O-collision partner interaction well depth.Reasonable correlation is observed for 15 quenching gases, but several exceptions are apparent.A similar trend in collision partner quenching efficiency for OH(A²Σ⁺) and CH3O(A²A₁) is noted and discussed.