title: Mirroring doubly excited resonances in argon.
abstract: New features are revealed in the low-energy photoionization spectrum of Ar by critically combining high photon resolution and differential photoelectron spectroscopic techniques. Two LS-forbidden doubly excited resonances are seen in the 3p(-1)(3/2, 1/2) partial cross sections which exhibit mirroring profiles, resulting in complete cancellation in the total photoionization cross section, as was predicted by Liu and Starace [Phys. Rev. A 59, R1731 (1999)]. These results demonstrate that a new class of weakly spin-orbit induced, mirroring resonances should be observable in partial, but not in total, collisional cross sections involving atoms, molecules, and solids in general.
authors.affiliation: Department of Physics, Western Michigan University, Kalamazoo, Michigan 49008, USA.
authors.forename: S E
authors.initials: SE
authors.lastname: Canton-Rogan
authors.forename: A A
authors.initials: AA
authors.lastname: Wills
authors.forename: T W
authors.initials: TW
authors.lastname: Gorczyca
authors.forename: M
authors.initials: M
authors.lastname: Wiedenhoeft
authors.forename: O
authors.initials: O
authors.lastname: Nayandin
authors.forename: C N
authors.initials: CN
authors.lastname: Liu
authors.forename: N
authors.initials: N
authors.lastname: Berrah