Scattering of 3He and 4He Atoms from 4He Clusters

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We develop a microscopic theory of elastic and inelastic scattering and sticking of 3He and 4He atoms impinging on superfluid 4He clusters. A number of essential aspects must be observed in a physically meaningful and reliable theory of such scattering processes. These are all connected with multiparticle processes, particularly the possibility of energy loss. These processes are (a) the coupling to low-lying excitations which is manifested in a finite imaginary part of the self energy, (b) the interaction with roton–like excitations and the broadening of the roton minimum due to finite–size effects, and (c) the discreteness of low–lying excitations in helium clusters.

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