title: Inner-shell photodetachment thresholds: unexpected long-range validity of the Wigner law.
abstract: Threshold behavior in inner-shell photodetachment is studied for the first time, specifically with 2-, 3-, or 4-electron emission from He- and S-. The threshold shapes are surprisingly consistent with the Wigner threshold law in all cases, despite large PCI effects observed in He-. In S-, the s-wave law is observed to agree with the data over an unprecedented range, more than an order of magnitude greater than predictions, and allows for the observation of the d-wave component. The measurements also demonstrate a means for obtaining precise core-excitation energies of free atoms.
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: N D
authors.initials: ND
authors.lastname: Gibson
authors.forename: C W
authors.initials: CW
authors.lastname: Walter
authors.forename: G D
authors.initials: GD
authors.lastname: Ackerman
authors.forename: I
authors.initials: I
authors.lastname: Dumitriu
authors.forename: N
authors.initials: N
authors.lastname: Berrah