title: Observation of the symmetry-forbidden 5sigmau-->ksigmau CS2 transition: a vibrationally driven photoionization resonance.
abstract: Vibrationally resolved photoelectron spectroscopy and Schwinger calculations are used to characterize a new resonance phenomenon in the 5sigma(u)-->ksigma(u) photoionization of CS2. This resonant channel is symmetry forbidden, yet is observable because it is activated by the antisymmetric stretching vibration. In addition, we show that a Franck-Condon breakdown occurs even though the energy dependence of the cross section is insensitive to geometry changes, which is unprecedented in photoionization.
authors.affiliation: Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, USA.
authors.forename: G J
authors.initials: GJ
authors.lastname: Rathbone
authors.forename: E D
authors.initials: ED
authors.lastname: Poliakoff
authors.forename: John D
authors.initials: JD
authors.lastname: Bozek
authors.forename: R R
authors.initials: RR
authors.lastname: Lucchese