Abstract
Necessary and sufficient conditions for the occurrence of strict Lindemann behaviour in thermal unimolecular reactions are presented; both strong-collision and weak-collision régimes are treated. For the strong-collision case, there is a simple connection between the shape of the fall-off curve and the specific rate constant function
k
(
E
), but there is no direct connection between the shape of the fall-off curve and the structure of the molecule. In the weak-collision case, strict Lindemann behaviour will occur only when bottleneck effects dominate, and as a prelude to the detailed examination of this problem, we derive the rate constant for a weak-collision master equation, valid for all pressures.
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