A simple expression is generated for the coefficient C3 of the asymptotic dispersion interaction ~z-3 between an atom and a surface. The basis of the derivation is the assumption of simple forms for the frequency dependence of the polarizability of the atom and the dielectric function of the solid. The expression yields the known value of C3 within a few percent for all cases for which it has been calculated previously. We use it to generate C3 values for a large number of systems not previously treated.
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Surfaces and Interfaces
- Surfaces, Coatings and Films
- Materials Chemistry