Model for V→ T, R relaxation: CH4 and CD4 mixtures

Abstract

A laser-fluorescence technique is used to determine vibration-to-vibration energy transfer rates for relaxation of HCl (v=1) and DCl (v=1) by CH4 and CD4. The rates of subsequent vibration-to-rotation and translation relaxation of the bending vibrations of CH4 and CD4 by several collision partners are measured. These data are interpreted in terms of a model which includes rotational motion of both collision partners, as well as relative translational motion. The variation of deactivation probabilities with the mass parameter, (μ†)−1=m−1+A1(μR1)−1+A2(μR2)−1, and temperature qualitatively indicates the relative importance of rotation and translation in each deactivation process.