A semiclassical model for atomic scattering from solid surfaces—He and Ne scattering from W(112)
A semiclassical formalism is presented which predicts specular atomic scattering from close-packed surfaces and either ’’rainbow’’ or diffractive scattering from strongly periodic surfaces. The intensities are a series of δ functions at the Laue conditions modulated by the product of the classical intensities and a structure factor accounting for interference among multiple trajectories within a unit cell. Narrow energy distributions in the incident beam and/or long wavelengths result in well-resolved diffracted beams, while broad distributions and/or small wavelengths result in coalesced beams which display only the ’’rainbowlike’’ intensity envelope. A simple elasticmodel using a 6–9 potential has been used to predict He and Ne scattering from W(112). For helium the peak positions and relative peak heights agree with the measuredscattering essentially within experimental reproducibility, but the peak widths calculated with this elasticmodel are too narrow and the intensity maxima too large. Neon calculations reproduce qualitatively the rainbow patterns observed in the experiments but neither the intensities nor the positions of the rainbow features are correct, indicating the existence of large inelastic effects.
- Research Organization:
- Department of Chemical Engineering, University of California, Berkeley, California 94720
- NSA Number:
- NSA-33-021106
- OSTI ID:
- 4077167
- Journal Information:
- J. Chem. Phys., v. 64, no. 1, pp. 45-56, Journal Name: J. Chem. Phys., v. 64, no. 1, pp. 45-56; ISSN JCPSA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
*NEON-- COLLISIONS
*TUNGSTEN-- ATOM COLLISIONS
640301* --Physics Research--Atomic
Molecular & Chemical Physics--Beams & Their Reactions
ANGULAR DISTRIBUTION
DIFFRACTION
N60100* --Physics (Atomic & Molecular)--Atomic
Electron
Ion & Molecular Beams & Reactions
N60200 --Physics (Atomic & Molecular)--Atomic & Molecular Properties
SEMICLASSICAL APPROXIMATION