A He4 atomic beam was used to probe the He-C (diamond) interaction. Selective adsorption features have been measured and three energy levels identified: 6.4, 3.0, and 1.1 meV with a standard deviation of 0.1 meV. Diffraction patterns showed weak diffraction up to the second order; a corrugation parameter of 0.021 was obtained with the use of a hard-wall model in the eikonal approximation. An extensive study of surface preparation was carried out and the results of He4 diffraction for different methods of surface cleaning are reported.
ASJC Scopus subject areas
- Condensed Matter Physics