ADSORBATE WAVE-FUNCTION MAPPING BY (E,2E) SPECTROSCOPY

The effect of oxygen adsorption on the (e,2e) spectra of annealed carb on films has been investigated. There are two regions of extra intensi ty in the measured spectral momentum density. One at 31 eV below the v acuum level and a broad one near 11 eV. No dispersion is found for eit her of these contributions. The dependence of intensity on electron mo mentum is consistent with almost exclusively s character for the deepe st level and a mixture of s and p character for the level closest to t he Fermi level. These results are compared with the electronic structu re of CO, O and graphite. The possibilities of the (e,2e) technique fo r the study of adsorbates are discussed.