title: Outstanding spin-orbit-activated interchannel coupling in the Cs and Ba 3d photoemission.
abstract: Partial 3d5/2 photoionization cross sections of atomic Cs and Ba as well as the asymmetry parameter beta of the angular distribution of the Cs 3d5/2 photoelectrons were investigated near the threshold of the 3d3/2 channel at about 750 eV and 800 eV, respectively. Strong electron correlations, in particular, the spin-orbit activated interchannel coupling between the 3d5/2 and 3d3/2 channels, govern the observed spectra. The most striking effect was found for beta5/2 of Cs with a dramatic increase from beta=1.0 to beta=1.5 in the energy region where the mixing between both channels causes a pronounced minimum in the partial 3d5/2 cross section. This result indicates the decisive influence of the interference term on the asymmetry parameter beta with its dependence on the phase difference between the outgoing p and f waves.
authors.affiliation: Institut für Optik und Atomare Physik, Technische Universität Berlin, Berlin, Germany.
authors.forename: T
authors.initials: T
authors.lastname: Richter
authors.forename: E
authors.initials: E
authors.lastname: Heinecke
authors.forename: P
authors.initials: P
authors.lastname: Zimmermann
authors.forename: K
authors.initials: K
authors.lastname: Godehusen
authors.forename: M
authors.initials: M
authors.lastname: Yalçinkaya
authors.forename: D
authors.initials: D
authors.lastname: Cubaynes
authors.forename: M
authors.initials: M
authors.lastname: Meyer