Abstract
Rates of cyclobutene isomerisation induced by excitation of the 6-0 CH stretching overtone at 16603 cm −1 have been measured as a function of the pressure of the bath gases He, Ar, CO 2, CH 4, SF 6 and cyclobutene. These data have been used to compare energy transfer parameters obtained from an approximate treatment of the effects of weak collisions with values from numerical solutions of the collisional master equation. Comparisons with data from previous photoactivation studies are also made. It is found that the combination of RRKM theory and an adequate treatment of inefficient intermolecular energy transfer can satisfactorily account for the observed results.
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