The structure, ordering, and chemistry of molecular overlayers on Rh(111) and Rh(100) single crystal surfaces: A vibrational spectroscopic and LEED crystallographic study
In order to understand the mechanism of adsorbate-substrate and adsorbate-adsorbate interactions on catalytically important surfaces, the surface structures and thermal chemistry of molecular overlayers on Rh(111) and Rh(100) single crystal surfaces have been studied under ultra-high vacuum conditions. For C-H and C-C bond activations the bonding and reactivity of unsaturated hydrocarbons, acetylene, ethylene, and benzene, chemisorbed on Rh(100) at 100-800 K were analyzed by using high-resolution electron energy loss spectroscopy (HREELS), low-energy electron diffraction (LEED) and thermal desorption spectroscopy (TDS). For N-O bond activation, the surface ordering, structure and activity of the (2 /times/ 2)-3NO and C(4 /times/ 2)-CCH/sub 3/ + NO monolayers on Rh(111) have been studied by dynamical LEED analysis and HREELS. Elucidation of adsorbate-adsorbate interactions was made possible by monitoring HREELS and work function changes upon coadsorption on Rh(111) and Rh(100) surfaces. By coadsorbing antiparallel dipole adsorbates, such as CO + hydrocarbons or CO + alkali metals, a new ordered, intermixed structure, can be formed. 292 refs., 60 figs., 17 tabs.
- Research Organization:
- Lawrence Berkeley Lab., CA (USA)
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 6185255
- Report Number(s):
- LBL-26346; ON: DE89010392
- Country of Publication:
- United States
- Language:
- English
Similar Records
Structure determination of molecular adsorbates with dynamical LEED and HREELS
Molecular ethylene adsorption on Rh(111) and Rh(100): estimation of the C-C stretching force constant from the surface vibrational frequencies
Related Subjects
360102* -- Metals & Alloys-- Structure & Phase Studies
360104 -- Metals & Alloys-- Physical Properties
ABSORPTION
ACETYLENE
ACTIVATION ENERGY
ALKYNES
CHALCOGENIDES
CHEMICAL BONDS
CHEMICAL REACTIONS
DECOMPOSITION
ELECTRON SPECTROSCOPY
ELEMENTS
ENERGY
ENERGY-LOSS SPECTROSCOPY
HYDROCARBONS
METALS
NITRIC OXIDE
NITROGEN COMPOUNDS
NITROGEN OXIDES
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
RHENIUM
SAMPLE PREPARATION
SORPTIVE PROPERTIES
SPECTROSCOPY
STABILITY
STRUCTURAL CHEMICAL ANALYSIS
SURFACE PROPERTIES
TRANSITION ELEMENTS
ULTRAHIGH VACUUM