PHONON-MEDIATED INDIRECT INTERACTIONS BETWEEN ADATOMS ON SURFACES - O ADATOMS ON SI(100)

In an earlier paper, we presented a general treatment of the phonon-mediated interactions between adatoms on surfaces, based on a lattice-dynamics approach. There the interaction was expressed in terms of the vibrational correlation functions of the surface and the interactions of the adatom with the rigid surface. In the present paper, we give the results of model calculations for the interactions between O adatoms on the dimer sites of the Si(100) surface. The approach developed earlier for the vibrational properties of the Si(100) surface is used, and a model for the interactions of the O adatoms with the surface is obtained on the basis of recent total-energy results.