title: Photodetachment of He- in the vicinity of the two-electron escape threshold.
abstract: Recording the yield of He(1snl(3)L) Rydberg states for n=11-14, we measure the photodetachment cross sections of metastable He-(1s2s2p(4)P(o)) ions in the vicinity of the two-electron escape threshold. We observe a large number of double Rydberg He- quartet state resonances and report energies and widths of intrashell states in the n=13-15 manifolds. Sharp thresholds are measured at He((3)P(o)) and He((3)D(e)) Rydberg states with preference for population of the former, whereas the He((3)S(e)) states are not populated, in agreement with qualitative theoretical arguments.
authors.affiliation: Department of Physics and Astronomy, University of Aarhus, 8000 Arhus C, Denmark.
authors.forename: V V
authors.initials: VV
authors.lastname: Petrunin
authors.forename: M H
authors.initials: MH
authors.lastname: Jacobsen
authors.forename: L B
authors.initials: LB
authors.lastname: Madsen
authors.forename: S A
authors.initials: SA
authors.lastname: Aseyev
authors.forename: T
authors.initials: T
authors.lastname: Andersen