Abstract
We investigated the system $p(2\ifmmode\times\else\texttimes\fi{}2)\mathrm{O}/\mathrm{M}\mathrm{o}(110)$ by electron energy-loss spectroscopy. The specular spectra of the ordered $p(2\ifmmode\times\else\texttimes\fi{}2)$ superstructure reveal an intense loss peak at $519{\mathrm{cm}}^{\mathrm{\ensuremath{-}}1},$ which corresponds to the perpendicular vibration of the O atoms adsorbed in the long bridge site. Increasing O coverage or hydrogen coadsorption causes a site conversion towards the triply coordinated hollow site. Measurements of the dispersion curves of the molybdenum Rayleigh wave and the longitudinal mode do not show any significant change compared to the clean surface. This fact is surprising because the experimentally observed Fermi surface of the $p(2\ifmmode\times\else\texttimes\fi{}2)$ superstructure should favor Fermi-surface nesting and hence an anomalous softening of the frequencies of the surface phonon modes, as previously observed for the hydrogen-saturated Mo(110) surface.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
