Surface chemical information from electron- and photon-stimulated desorption. [115 references]
Conference
·
OSTI ID:6524398
Electron- and Photon-Stimulated Desorption can provide atomic and structural information on the chemical state of surfaces and adsorbates on surfaces. Information is contained in the variation of desorption yield with chemical state, ion energy distributions, ion angular distributions, and in desorption thresholds and spectral dependence. Current models for desorption discuss both ionic and covalent systems and provide considerable insight into the environment of desorbing species. Widely studied examples include oxygen on metals, CO on metals, hydrogen on metals and semiconductors, and cryogenic molecular solids as models for desorption. All of theses systems show variations in ion yield with chemical state of the desorbing species which in many cases fit existing models but in some cases suggest new mechanisms of desorption. Ion energy and angular distribution provide signatures of the type of state yielding desorption and the local structure of the desorption site. Desorption spectra can provide electronic and structural details of the bonding site from the analysis of near edge and extended fine structure. Near edge structure can also be used as a signature by comparison to systems of known chemical environment. The above examples of the combined use of the different variations of the desorption experiment are discussed. 115 references, 7 figures.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (USA)
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 6524398
- Report Number(s):
- SAND-82-3002C; CONF-8209101-1; ON: DE83007367
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400500* -- Photochemistry
400600 -- Radiation Chemistry
640301 -- Atomic
Molecular & Chemical Physics-- Beams & their Reactions
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CHALCOGENIDES
CHEMICAL STATE
COLLISIONS
DESORPTION
DOCUMENT TYPES
ELECTRON COLLISIONS
ELEMENTS
HYDROGEN
MATERIALS
METALS
NONMETALS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PHOTON COLLISIONS
REVIEWS
SEMICONDUCTOR MATERIALS
SURFACE PROPERTIES
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400500* -- Photochemistry
400600 -- Radiation Chemistry
640301 -- Atomic
Molecular & Chemical Physics-- Beams & their Reactions
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CHALCOGENIDES
CHEMICAL STATE
COLLISIONS
DESORPTION
DOCUMENT TYPES
ELECTRON COLLISIONS
ELEMENTS
HYDROGEN
MATERIALS
METALS
NONMETALS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PHOTON COLLISIONS
REVIEWS
SEMICONDUCTOR MATERIALS
SURFACE PROPERTIES