Electron energy loss spectroscopy of ethylene on Ag(110) precovered with oxygen: energy dependence of the cross section |
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Authors: | C Backx CPM De Groot |
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Institution: | Koninklijke/Shell-Laboratorium, Amsterdam (Shell Research BV), P.O. Box 3003, 1003 AA Amsterdam, The Netherlands |
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Abstract: | The intensities of the CH out-of-plane bending (v7) and CH stretch (v1) vibrations of ethylene adsorbed on Ag(l 10) precovered with oxygen have been measured in EELS as a function of beam energy from 2 to 20 eV. The energy dependence of the v7 vibration is satisfactorily described by the dipole approximation. For the v1 vibration, which is purely dipole forbidden, an entirely different energy dependence is found, with a maximum intensity at a beam energy of 2 eV. Comparison of the EEL intensities observed experimentally with those predicted from the dipole moments of the free molecule confirms the conclusion that the molecular plane of chemisorbed ethylene is parallel to the surface. |
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