title: Photoexcitation of He- hollow-ion resonances: observation of the 2s2p2 4P state.
abstract: Highly correlated states are studied in He-, a fundamental 3-electron system and prototypical negative ion. The 2s2p(2) 4P state is observed for the first time. This state is detected in a resonant simultaneous double-Auger decay of unprecedented strength. In addition, the first measurements of photodetachment cross sections, positions, widths, and shapes of triply excited resonances in He- are reported. These measurements provide a sensitive test for several sophisticated ab initio calculations, and indicate differences in the position and shape of some structures.
authors.affiliation: Western Michigan University, Physics Department, Kalamazoo, Michigan 49008-5151, USA.
authors.forename: R C
authors.initials: RC
authors.lastname: Bilodeau
authors.forename: J D
authors.initials: JD
authors.lastname: Bozek
authors.forename: A
authors.initials: A
authors.lastname: Aguilar
authors.forename: G D
authors.initials: GD
authors.lastname: Ackerman
authors.forename: G
authors.initials: G
authors.lastname: Turri
authors.forename: N
authors.initials: N
authors.lastname: Berrah