Temperature dependence of intermolecular vibrational energy transfer in the two-channel cyclopropane-1,1-d2 system. Neon bath gasa)

Abstract

The competitive, two-channel cyclopropane-1, 1-d2 isomerization to propylene has been used for the study of the temperature dependence of vibrational energy transfer efficiency. This note reports work with Ne bath gas at 823 and 1050 K. The fall-off region was k/k∞≊0.01. The average amount of energy <ΔE≳ transferred per collision with Ne from activated cyclopropane-1, 1-d2 molecules declines with temperature rise, from 575 cm−1 at 823 K to 275 cm−1 at 1050 K. The relative efficiency of collisions β̄ω declines from 0.062 at 823 K to 0.012 at 1050 K.