Rotational and translational effects in collisions of electronically excited diatomic hydrides

摘要: Collisional quenching and vibrational energy transfer proceed competitively with rotational for several excited states of the diatomic radicals OH, NH, CH. This occurs a wide variety molecular collision partners. phenomenon permits examination influence motion on dynamics these theoretically tractable species. Measurements can also be made as function temperature, i.e., velocity. In OH(A{sup 2}{Sigma}{sup +}), both are found to decrease an increase in level, while decreases increasing temperature. behavior indicates that OH anisotropic attractive forces govern entrance channel collisions. The NH(A{sup 3}II{sub i}) by many (although not all) partners translational energy, NH(c{sup 1}II) behaves much like +}). However, CH(A{sup 2}{Delta}) appears rotation but increases suggesting this case involving barrier or repulsive wall. Such similarities differences should furnish useful comparisons simple detailed theoretical pictures appropriate dynamics.