title: Spectrum of doubly excited states in the K- ion.
abstract: The energies and widths of doubly excited states of the K- ion in the vicinity of the K(5 2D,7 2S,5 2F) thresholds have been measured in high resolution using a sensitive collinear laser-ion beam apparatus. These transient states appeared as resonances in the partial cross section for photodetachment via the K(5 2S)+e(-)(epsilon(p)) channel. Series of two states below the 5 2D threshold and four states below the 5 2F threshold have been found. The relative widths of members of the series below the 5 2F threshold exhibit anomalous behavior, as predicted by a semiclassical model.
authors.affiliation: Department of Physics, Chalmers University of Technology and Göteborg University, SE-412 96 Göteborg, Sweden.
authors.forename: I Y
authors.initials: IY
authors.lastname: Kiyan
authors.forename: U
authors.initials: U
authors.lastname: Berzinsh
authors.forename: J
authors.initials: J
authors.lastname: Sandström
authors.forename: D
authors.initials: D
authors.lastname: Hanstorp
authors.forename: D J
authors.initials: DJ
authors.lastname: Pegg