Vibrational self-relaxation of group VI hydrides. A simple theoretical approach

Abstract

The vibrational–collisional self-relaxation process (1–0) of the bending mode of Group VI hydrides has been investigated theoretically at room temperature. A simple (V–R) model was developed assuming head-on collisions between an excited harmonic oscillator and a rotator. The role of translation has been neglected. This approach has given good agreement between the calculated and experimental values of relaxation probabilities especially for their relative ratios and the isotope effect. It reflects the importance of (V–R) transfer and roles of moments of inertia, frequencies of transitions and intermolecular forces for the vibrational deactivation of such molecules.