title: Inverse temperature dependent lifetimes of transient S(N)2 ion-dipole complexes.
abstract: The association and collisional stabilization of the S(N)2 entrance channel complex [Cl(-)...CH3Cl]* is studied in a low-temperature radiofrequency ion trap. The temperature dependence of the ternary rate coefficient is measured and a much stronger inverse temperature dependence than expected from a simple statistical calculation is found. From these data the lifetime of the transient S(N)2 complex has been derived as a function of temperature. It is suggested that the inverse temperature dependent rates of nonsymmetric S(N)2 reactions are related to the observed inverse temperature dependence of the transient ion-dipole complexes.
authors.affiliation: Physikalisches Institut, Universität Freiburg, Hermann-Herder-Strasse 3, 79104 Freiburg, Germany.
authors.forename: J
authors.initials: J
authors.lastname: Mikosch
authors.forename: R
authors.initials: R
authors.lastname: Otto
authors.forename: S
authors.initials: S
authors.lastname: Trippel
authors.forename: C
authors.initials: C
authors.lastname: Eichhorn
authors.forename: M
authors.initials: M
authors.lastname: Weidemüller
authors.forename: R
authors.initials: R
authors.lastname: Wester