Ion-polar molecule collisions: Nonreactive collisions of Cl− with dichloroethylene and difluorobenzene

Abstract

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.