Publikation:

Ripplons in 4He films observed by neutron scattering

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1992

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Lauter, Hans J.
Godfrin, Henri
Frank, V. L. P.

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Physical Review Letters. 1992, 68(16), pp. 2484-2488. Available under: doi: 10.1103/PhysRevLett.68.2484

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We report the first observation of ripplon excitations at large wave vectors. The experiments were performed on liquid-4He films of atomic thickness adsorbed on a graphite substrate. Neutron-scattering techniques were used to determine the inelastic structure factor of surface (ripplon) and bulklike (phonon-roton) elementary excitations. The lowest lying mode at low wave vectors is experimentally shown to be a surface mode; its dispersion relation agrees well with the quantum-hydrodynamic theory of Edwards and Saam. The predictions of recent microscopic models are compared to the data at high energies and momenta.

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ISO 690LAUTER, Hans J., Henri GODFRIN, V. L. P. FRANK, Paul LEIDERER, 1992. Ripplons in 4He films observed by neutron scattering. In: Physical Review Letters. 1992, 68(16), pp. 2484-2488. Available under: doi: 10.1103/PhysRevLett.68.2484
BibTex
@article{Lauter1992Rippl-9430,
  year={1992},
  doi={10.1103/PhysRevLett.68.2484},
  title={Ripplons in 4He films observed by neutron scattering},
  number={16},
  volume={68},
  journal={Physical Review Letters},
  pages={2484--2488},
  author={Lauter, Hans J. and Godfrin, Henri and Frank, V. L. P. and Leiderer, Paul}
}
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