Breakdown of the two-step model in K-shell photoemission and subsequent decay probed by the molecular-frame photoelectron angular distributions of CO2 |
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| Authors: | Liu X-J Fukuzawa H Teranishi T De Fanis A Takahashi M Yoshida H Cassimi A Czasch A Schmidt L Dörner R Wang K Zimmermann B McKoy V Koyano I Saito N Ueda K |
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| Institution: | Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan. |
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| 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. |
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