Abstract
Vibrational high-resolution electron energy loss spectroscopy has been used to identify the shape resonance for CO chemisorbed on Ni(110) at room temperature. The intensity of the CO stretching vibration is found to be enhanced at an incident electron energy E i = 18 eV. Angular-dependent measurements were recorded over a range of incident electron energies ( E i = 9–35 eV). For E i = 18 eV, the intensity of the CO stretch is peaked dominantly along the surface normal. This correlates with enhanced resonance scattering along the CO internuclear bond axis. We compare the energy of the shape resonance with previous electron scattering studies of gas-phase and condensed layers of CO, and also with recent inverse photoemission studies of CO chemisorbed on Ni(100).
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