IMPURITY DYNAMICS OF BOSON LIQUID-FILMS

The dynamic properties of He-3 impurity atoms in He-4 films are calcul ated using a dynamic, microscopic variational theory. Our results for the binding energies, excitations energies, and effective masses on st rong substrates agree well with experimental data of the Amherst group . No substrate bound states are found for substrates as weak as Na. Th e theory also provides an unambiguous description of atom scattering a nd sticking. The dependence of the sticking and scattering coefficient s on the substrate and the excitations in the film have been calculate d.