Photon energy dependent branching ratios of the inner valence satellites in the photoemission of solid ethylene

Measurements of the photoelectron branching ratios of the outer and inner valance emission of solid ethylene (C2H4) as a function of photon energy between 40 eV and 200 eV have resulted in the identification of the various photoemission lines. Whereas the single particle picture is valid for photoemission from the outer valance orbitals, the excitation of the innermost valance orbital of ethylene (C 2s derived, 2ag symmetry) is accompanied by a shake-up satellite. Ethylene, along with acetylene, is the simplest hydrocarbon that exhibits significant shake-up structure. The experiments were performed on NSLS bealine U7A using a plane grating monochromator.