Abstract
Helium scattering from the (112) face of tungsten has been shown by Stickney to,exhibit diffraction when the incident beam is in the (11̄0) direction, i.e. perpendicular to the ridge-trough structure of the surface. This study reports a more complete study of helium diffranction from this surface. The positions of the (1̄0) and (10) beams are shown to follow the Bragg relation for incident angles from 20° to 70° and the relative intensities of the diffraction beams to the specular beam are in agreement with simple diffraction theory. Debye-Waller analysis of the thermal attenuation of the specular scattering leads to unrealistically high values of the surface Debye temperature while electron scattering from the same surface gives Debye temperatures of 1/2 to 2/3 the bulk. Neon scattering in the (11̄0) direction gives rainbow scattering while argon is scattered in a single pseudo-specular lobe. Attempts to deduce interaction energies from measurements of selective helium adsorption will also be described.
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