title: Breakdown of the two-step model in K-shell photoemission and subsequent decay probed by the molecular-frame photoelectron angular distributions of CO2.
abstract: We report results of measurements and of Hartree-Fock level calculations of molecular-frame photoelectron angular distributions (MFPADs) for C 1s photoemission from CO2. The agreement between the measured and calculated MFPADs is on average reasonable. The measured MFPADs display a weak but definite asymmetry with respect to the O+ and CO+ fragment ions at certain energies, providing evidence for an overlap of gerade and ungerade final ionic states giving rise to a partial breakdown of the two-step model of core-level photoionization and its subsequent Auger decay.
authors.affiliation: Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan.
authors.forename: X-J
authors.initials: XJ
authors.lastname: Liu
authors.forename: H
authors.initials: H
authors.lastname: Fukuzawa
authors.forename: T
authors.initials: T
authors.lastname: Teranishi
authors.forename: A
authors.initials: A
authors.lastname: De Fanis
authors.forename: M
authors.initials: M
authors.lastname: Takahashi
authors.forename: H
authors.initials: H
authors.lastname: Yoshida
authors.forename: A
authors.initials: A
authors.lastname: Cassimi
authors.forename: A
authors.initials: A
authors.lastname: Czasch
authors.forename: L
authors.initials: L
authors.lastname: Schmidt
authors.forename: R
authors.initials: R
authors.lastname: Dörner
authors.forename: K
authors.initials: K
authors.lastname: Wang
authors.forename: B
authors.initials: B
authors.lastname: Zimmermann
authors.forename: V
authors.initials: V
authors.lastname: McKoy
authors.forename: I
authors.initials: I
authors.lastname: Koyano
authors.forename: N
authors.initials: N
authors.lastname: Saito
authors.forename: K
authors.initials: K
authors.lastname: Ueda