Momentum transfer rate constants for Cl− with dichloroethylene and difluorobenzene isomers have been studied by an ion cyclotron resonance line-broadening technique. Rate constants for nonpolar isomers are compared to those predicted by the Langevin theory and the rate constants for polar molecules are compared to the average-dipole-orientation (ADO) theory. All experimental rate constants are consistently higher than theoretical predictions. The incremental effect of a permanent dipole on momentum transfer collision frequencies predicted by ADO theory is in satisfactory agreement with experimental results.
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Su et al. (1974) studied this question.