An alternative method for implementing RRKM theory for unimolecular reactions with highly flexible transition states is using conventional coordinates. The number of available states for motion in the transition state state N_(EJ) is determined an appropriate average over the absolute space orientations and body-fixed momenta of the two fragments. The results calculations of N_(EJ) for the C_2H_6 → 2CH_3 reaction (or alternatively for the corresponding recombination reaction) obtained the present expression are shown to be equivalent numerically to those obtained previously by Wardlaw and Marcus.
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Klippenstein et al. (1988) studied this question.