Accession Number : ADA298569

Title :   Evidence for Specific and Non-Specific Adsorption of ClO4 on Ag(110).

Descriptive Note : Technical rept. Jun 94-May 95,

Corporate Author : WASHINGTON UNIV SEATTLE

Personal Author(s) : Krasnopoler, A. ; Stuve, E. M.

PDF Url : ADA298569

Report Date : 15 AUG 1995

Pagination or Media Count : 21

Abstract : The coadsorption of ClO4 with H2O on Ag(110) was studied as a model of anion adsorption at the solid-liquid interface. Thermal desorption spectroscopy, low energy electron diffraction, and high resolution electron energy loss spectroscopy were used to investigate the interactions between perchlorate, water and the metal surface. The vibrational spectrum of adsorbed ClO4 is an indicator of its adsorption geometry. For ClO4 adsorbed on the clean surface, losses at 640, 915, 1020 and 1220 /cm indicate that adsorption occurs through three oxygen atoms (tridentate) with a symmetry of C3v or lower. When coadsorbed with H2O, the vibrational spectrum resembles that of fully solvated, tetrahedral ClO4(-) (T sub d symmetry) with bands at 610, 880 and 1090 /cm. The increase in symmetry indicates that direct interaction with the metal is lost and is considered evidence for non-specifically adsorbed ClO4 in UHV. The thermodynamic feasibility of this process is also discussed. jg p.3

Descriptors :   *ADSORPTION, *SILVER, *PERCHLORATES, METALS, VIBRATION, SPECTROSCOPY, INTERACTIONS, INTERFACES, LIQUIDS, THERMODYNAMICS, WATER, ATOMS, SOLIDS, HIGH RESOLUTION, SURFACES, OXYGEN, SPECTRA, FEASIBILITY STUDIES, LOW ENERGY, SYMMETRY, GEOMETRY, ELECTRON DIFFRACTION, DESORPTION, ANIONS, THERMAL RADIATION.

Subject Categories : Inorganic Chemistry
      Physical Chemistry
      Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE