Mode-to-mode energy transfer in 1B2 aniline induced by very low energy collisions with He

Collision induced vibrational relaxation of selected single vibronic levels of 1B2 aniline has been studied for the collision energy range approx.1--approx.100 cm-1. We find that very low energy collisions with He lead to efficient and selective mode-to-mode energy transfer, with the collision energy required for efficient relaxation varying with the nature of the initial vibrational excitation. This dependence on initial vibrational state is consistent with the orbiting resonance model of the collision previously proposed