ARUPS of water adsorption on Si(100) and Si(111) surfaces

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Abstract
Water adsorption on Si(100) and Si(111) surfaces at room temperature has been investigated by angle-resolved ultraviolet photo-electron spectroscopy (ARUPS) using synchrotron radiation. Earlier angle-integrated UPS studies have suggested that the adsorption is non-dissociative on (100) and dissociative on (111). The ARUPS data indicate that the adsorption is dissociative on both surfaces; the adsorbate-related valence features are similar and their binding energies agree closely with a self-consistent calculation of quasi-molecular SiOH. In this common dissociative-adsorption scheme there is no conflict between UPS and other techniques. The calculation provides an assignment of features which may allow the adsorption geometry to be probed by the application of photo-emission selection rules.