Effects of hydrogen on the dynamics of the Mo0.95Re0.05(110) surface

Michio Okada, A. P. Baddorf, D. M. Zehner, E. W. Plummer

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8 Scopus citations

Abstract

The effect of adsorbed H on the Mo0.95Re0.05(110) surface has been investigated. Results obtained from low-energy electron diffraction (LEED), high-resolution electron energy loss spectroscopy (HREELS) and angle-resolved ultraviolet photoemission spectroscopy (ARUPS) are presented. A (2 × 2) LEED pattern is observed for H coverages around Θ∼0.5 ML and is attributed to reconstruction of the substrate. At higher coverages, a (1 × 1) pattern is observed. Two peaks are observed at loss energies of 99 and 153 meV in the HREELS spectra for the H-saturated Mo0.95Re0.05(110) surface consistent with a quasi-trigonal adsorption site. Both peaks show an isotopic shift, confirming that they are due to hydrogen vibrational modes. A two-dimensional Fermi surface was determined using ARUPS for the H-saturated Mo0.95Re0.05(110) surface. Fermi-surface nesting vectors were observed at the momentum predicted by theoretical calculations for H-saturated Mo(110) where a phonon anomaly is observed.

Original languageEnglish
Pages (from-to)416-422
Number of pages7
JournalSurface Science
Volume363
Issue number1-3
DOIs
StatePublished - Aug 1 1996

Funding

The authorsw ould like to thank G.W. Ownby for preparationof the sample.T he work at ORNL was supported by the Division of Materials Sciences, U.S. Department of Energy, under contract DE-AC05-96OR22464w ith Lockheed Martin Energy ResearchC orp. and the Japanese Governmentt hrough the NEDO International Joint ResearchG rant Program.

Keywords

  • Angle resolved photoemission
  • Electron energy loss spectroscopy
  • Hydrogen
  • Low-energy electron diffraction (LEED)
  • Low-index single-crystal surfaces
  • Molybdenum
  • Rhenium

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