High-resolution electron-energy-loss spectroscopy: Relationship between loss intensity and coverage

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Abstract
Depending on the primary energy a strong disproportionality has been observed between the relative loss intensity and the CO coverage on Ni(111) in high-resolution electron-energy-loss spectroscopy for dipole scattering (specular reflection). By consideration of the two-step scattering process that has been theoretically derived in the quantum-mechanical treatment of dipole scattering, it can be shown that this effect is caused by specific variations of the reflectivity as a function of coverage and primary energy. It therefore turns out that the data also prove the validity of the quantum-mechanical treatment of the dipole-scattering process experimentally in more detail.