Vibrational spectra of chemisorbed molecular clusters: H/sub 2/O on Ru(001)

Journal Article · Tue May 15 04:00:00 EDT 1984 · J. Chem. Phys.; (United States)

OSTI ID:6899318

Thiel, P A; DePaola, R A; Hoffmann, F M

Electron energy loss spectroscopy and thermal desorption mass spectroscopy have been used to correlate vibrational spectra of H/sub 2/O on Ru(001) with ESDIAD patterns reported recently. We find that the ''extended bilayer'' is characterized by a sharp fundamental O--H vibration at 3500--3565 cm/sup -1/ which is assigned to nonhydrogen-bonded OH bonds of molecularly adsorbed water. Hydrogen bonds within the well-ordered bilayer give rise to features at approx.3290--3450 cm/sup -1/ which are of relatively weak intensity in electron scattering due to the orientations of these bonds. In addition, very small clusters exhibit a weak vibrational mode at approx.2935 cm/sup -1/ which possibly represents H/sub 2/O molecules with one O--H bond pointing into the surface. Isolated H/sub 2/O molecules at low temperature and low coverage exhibit a fundamental O--H vibration at 3600 cm/sup -1/. A reinterpretation of the thermal desorption spectra is suggested.

• Research Organization: Department of Chemistry and Ames Laboratory, Iowa State University, Ames, Iowa 50011
• OSTI ID: 6899318
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 80:10; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
AGGLOMERATION
CHEMICAL REACTIONS
CHEMISORPTION
ELECTRON SPECTROSCOPY
ELEMENTS
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EXCITED STATES
FLUIDS
GASES
MASS SPECTROSCOPY
METALS
OSCILLATION MODES
PLATINUM METALS
RUTHENIUM
SEPARATION PROCESSES
SORPTION
SORPTIVE PROPERTIES
SPECTROSCOPY
SURFACE PROPERTIES
TRANSITION ELEMENTS
VAPORS
VIBRATIONAL STATES
WATER VAPOR