Abstract
The chemisorption of oxygen on Cu(110) has been studied with electron energy loss vibrational spectroscopy and low energy electron diffraction. Depending on crystal temperatures during oxygen exposure and subsequent heat treatments, (1 × 1), c(6 × 2), and (2 × 1) LEED patterns are obtained. However, in all cases and independent of exposure, a single vibrational energy was observed at 49 meV for 16O and at 46 meV for 18O. This invariance of energy suggests a shielded site location in or beneath the surface in support of the result of a recent ion scattering study. The (2 × 1) structure is shown to form in islands at less than saturation coverage on the basis of observed vibrational intensities.
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