Surface geometry determination with Medium Energy Ion Scattering: Channeling and Blocking

Thesis/Dissertation · Sun Jan 01 04:00:00 EST 1984

OSTI ID:5752828

Adams, E D

Traditionally, surface geometry has been determined with the technique of low energy electron diffraction (LEED). Over the past few years, a new technique has been developed that is computationally less demanding and potentially more accurate than LEED. This technique, developed by Turkenburg, et al, at the FOM Institute in Amsterdam, is Medium Energy Ion Scattering (MEIS) combined with Channeling and Blocking (-CB). MEIS-CB employs a novel approach to the analysis of light ions scattered from a single crystal surface. The goals of this thesis were to develop a viable MEIS-CB system to be used for the accurate determination of surface geometry, then to apply that system to study surface geometry. The surfaces investigated include: Ni (110), CO/Ni (110), and Fe (111). The results can be summarized as follows: 1) The Ni (110) surface was found to exhibit a 4 +/- 1% contraction of the uppermost interlayer spacing. 2) Upon adsorption of a monolayer of CO, the clean surface contraction was replaced by an expansion to the bulk interlayer spacing. 3) The Fe (111) surface was found to exhibit a more complex surface geometry than reported by a recent LEED study.

• OSTI ID: 5752828
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400103 -- Radiometric & Radiochemical Procedures-- (-1987)
656000* -- Condensed Matter Physics
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CHANNELING
CHEMICAL ANALYSIS
COHERENT SCATTERING
COMPARATIVE EVALUATIONS
DIFFRACTION
ELECTRON DIFFRACTION
ELEMENTS
GEOMETRY
ION CHANNELING
ION SCATTERING ANALYSIS
IRON
MATHEMATICS
METALS
NICKEL
NONDESTRUCTIVE ANALYSIS
SCATTERING
SURFACES
TRANSITION ELEMENTS