Rate constants of quenching and vibrational relaxation in the OH(${{A}^{2}}{{ \Sigma }^{+}},v=0,1$ ), manifold with various colliders

Abstract

Laser induced fluorescence is intensively used for the detection of OH in many atmospheric pressure discharge devices. At this pressure, a quantitative knowledge of the collision phenomena in the upper excited state is critical. Here we report the measurement at T = 300 K of a set of rate constants of electronic quenching and vibrational relaxation of the OH ( A 2 Σ + , v ′ = 0 , 1 ) electronic state, by collision with N 2 , O 2 , H 2 O, CO 2 , CO, H 2 , D 2 , CH 4 , C 2 H 2 , C 2 H 4 , C 2 H 6 . These are the main gases in applications like plasma medicine, hydrocarbons reforming and CO 2 conversion. Available literature data are revisited, and new data are added, mostly relevant to v ′ = 1 quenching and vibrational relaxation.