Breakdown of the two-step model in K-shell photoemission and subsequent decay probed by the molecular-frame photoelectron angular distributions of CO2

X-J Liu; H Fukuzawa; T Teranishi; A De Fanis; M Takahashi; H Yoshida; A Cassimi; A Czasch; L Schmidt; R Dörner; K Wang; B Zimmermann; V McKoy; I Koyano; N Saito; K Ueda

doi:10.1103/PhysRevLett.101.083001

Breakdown of the two-step model in K-shell photoemission and subsequent decay probed by the molecular-frame photoelectron angular distributions of CO2

Phys Rev Lett. 2008 Aug 22;101(8):083001. doi: 10.1103/PhysRevLett.101.083001. Epub 2008 Aug 20.

Authors

X-J Liu¹, H Fukuzawa, T Teranishi, A De Fanis, M Takahashi, H Yoshida, A Cassimi, A Czasch, L Schmidt, R Dörner, K Wang, B Zimmermann, V McKoy, I Koyano, N Saito, K Ueda

Affiliation

¹ Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan.

PMID: 18764609
DOI: 10.1103/PhysRevLett.101.083001

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.