title: Threshold photodetachment in a repulsive potential.
abstract: We report on the first experimental observation of a new threshold behavior observed in the 5(2)G partial channel in photodetachment of K(-). It arises from the repulsive polarization interaction between the detached electron and the residual K(5(2)G) atom, which has a large negative dipole polarizability. In order to account for the observation in the K(5(2)G) channel, we have developed a semiclassical model that predicts an exponential energy dependence for the cross section. The measurements were made with collinear laser-ion beams and a resonance ionization detection scheme.
authors.affiliation: Department of Physics, University of Gothenburg, SE-412 96 Gothenburg, Sweden. anton.lindahl@physics.gu.se
authors.forename: A O
authors.initials: AO
authors.lastname: Lindahl
authors.forename: J
authors.initials: J
authors.lastname: Rohlén
authors.forename: H
authors.initials: H
authors.lastname: Hultgren
authors.forename: I Yu
authors.initials: IY
authors.lastname: Kiyan
authors.forename: D J
authors.initials: DJ
authors.lastname: Pegg
authors.forename: C W
authors.initials: CW
authors.lastname: Walter
authors.forename: D
authors.initials: D
authors.lastname: Hanstorp