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Quantum sticking, scattering and transmission of 4He atoms from superfluid 4He surfaces

C. E. Campbell·E. Krotscheck·M. Saarela
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Abstract

We develop a microscopic theory of the scattering, transmission, and sticking of 4He atoms impinging on a superfluid 4He slab at near normal incidence, and inelastic neutron scattering from the slab. The theory includes coupling between different modes and allows for inelastic processes. We find a number of essential aspects that must be observed in a physically meaningful and reliable theory of atom transmission and scattering; all are connected with multiparticle scattering, particularly the possibility of energy loss. These processes are (a) the coupling to low-lying (surface) excitations (ripplons/third sound) which is manifested in a finite imaginary part of the self energy, and (b) the reduction of the strength of the excitation in the maxon/roton region.

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C. E. Campbell, E. Krotscheck, M. Saarela. 1998-02-17. Quantum sticking, scattering and transmission of 4He atoms from superfluid 4He surfaces. https://doi.org/10.1103/physrevlett.80.2169

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