Theoretical calculations and experimental data are reported for He scattering from a graphite surface covered with an alkali-metal overlayer. The computed interaction potential has a very shallow well depth (≤, 1 meV) in the case of a (2 × 2) layer. The predicted corrugation is also very small, corresponding to rather weak elastic diffraction beams. The calculated diffraction intensity is less than 2 percent of the specular intensity for a 17.4 meV He beam. No He diffraction was observed in the experiment on K, Rb, and Cs overlayers, indicating that these surfaces are even less corrugated than the calculation predicts.
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Surfaces and Interfaces
- Surfaces, Coatings and Films
- Materials Chemistry