Elastic Interaction of Two Atoms Adsorbed on a Solid Surface
CALIFORNIA UNIV SAN DIEGO LA JOLLA DEPT OF PHYSICS
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The long-range interaction of two adsorbed atoms mediated by the elastic distortion of the substrate is calculated classically for an elastically isotropic substrate. For identical atoms, the interaction is repulsive for different atoms, it can be repulsive or attractive. It varies as 1rho cubed with the distance rho between the two adsorbed atoms. This is the same spatial dependence as for the dipole-dipole interaction between two adsorbed atoms. For two xenon atoms adsorbed on silver, the elastic interaction is about one order of magnitude smaller than the dipole-dipole interaction. The interaction energy is inversely proportional to the shear modulus of the substrate, so that it may become quite large near a distortive phase transition.
- Solid State Physics