title: Photoelectron angular distributions from O K shell of oriented CO molecules: A critical comparison between theory and experiment
abstract: The dynamical information (ten dipole matrix elements and eight phase differences) has been deduced from the measured angular distributions of photoelectrons from O K shell of oriented CO molecules near the ionization threshold in the region of a sigma(*) shape resonance. Light polarization parallel and perpendicular to the molecular axis has been used. An important contribution of six lsigma partial waves with 0</=l</=5 to the sigma(*) shape resonance is demonstrated. A comparison with our calculations in the relaxed core Hartree-Fock approximation reveals only a qualitative agreement, therefore a more advanced theory is needed.
authors.affiliation: Photon Factory, Institute of Materials Structure Science, Oho 1-1, Tsukuba-shi, Ibaraki-ken 305-0801, Japan.
authors.initials: K
authors.lastname: Ito
authors.initials: J
authors.lastname: Adachi
authors.initials: Y
authors.lastname: Hikosaka
authors.initials: S
authors.lastname: Motoki
authors.initials: K
authors.lastname: Soejima
authors.initials: A
authors.lastname: Yagishita
authors.initials: G
authors.lastname: Raseev
authors.initials: NA
authors.lastname: Cherepkov