An Interpretation of Dispersionless Modes in Neutron Diffraction Experiments on Helium Films

V. Apaja; H. Godfrin; E. Krotscheck; H. J. Lauter

doi:10.1023/A:1012226013904

An Interpretation of Dispersionless Modes in Neutron Diffraction Experiments on Helium Films

V. Apaja
, H. Godfrin
, E. Krotscheck
, H. J. Lauter

Physics

Johannes Kepler University Linz
University of Oulu
C.N.R.S.
Institut Laue-Langevin

Research output: Contribution to journal › Article › peer-review

4 Scopus citations

Abstract

We analyze the dynamic structure function S(q, ω) for neutron scattering off helium films in the direction perpendicular to the substrate. "Dispersionless-modes" that have been found in neutron diffraction experiments on helium films adsorbed on graphite powder (H. J. Lauter, H. Godfrin, and H. Wiechert, Excitations in ⁴He films, in "Proceedings of the Second International Conference on Phonon Physics," World Scientific, 1985) are interpreted as standing waves or resonances of the helium liquid perpendicular to the substrate. Our interpretation is supported by microscopic calculations of the ⁴He dynamic structure function.

Original language	English
Pages (from-to)	599-607
Number of pages	9
Journal	Journal of Low Temperature Physics
Volume	124
Issue number	5-6
DOIs	https://doi.org/10.1023/A:1012226013904
State	Published - 2001

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title = "An Interpretation of Dispersionless Modes in Neutron Diffraction Experiments on Helium Films",

abstract = "We analyze the dynamic structure function S(q, ω) for neutron scattering off helium films in the direction perpendicular to the substrate. {"}Dispersionless-modes{"} that have been found in neutron diffraction experiments on helium films adsorbed on graphite powder (H. J. Lauter, H. Godfrin, and H. Wiechert, Excitations in 4He films, in {"}Proceedings of the Second International Conference on Phonon Physics,{"} World Scientific, 1985) are interpreted as standing waves or resonances of the helium liquid perpendicular to the substrate. Our interpretation is supported by microscopic calculations of the 4He dynamic structure function.",

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AU - Krotscheck, E.

AU - Lauter, H. J.

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Y1 - 2001

N2 - We analyze the dynamic structure function S(q, ω) for neutron scattering off helium films in the direction perpendicular to the substrate. "Dispersionless-modes" that have been found in neutron diffraction experiments on helium films adsorbed on graphite powder (H. J. Lauter, H. Godfrin, and H. Wiechert, Excitations in 4He films, in "Proceedings of the Second International Conference on Phonon Physics," World Scientific, 1985) are interpreted as standing waves or resonances of the helium liquid perpendicular to the substrate. Our interpretation is supported by microscopic calculations of the 4He dynamic structure function.

AB - We analyze the dynamic structure function S(q, ω) for neutron scattering off helium films in the direction perpendicular to the substrate. "Dispersionless-modes" that have been found in neutron diffraction experiments on helium films adsorbed on graphite powder (H. J. Lauter, H. Godfrin, and H. Wiechert, Excitations in 4He films, in "Proceedings of the Second International Conference on Phonon Physics," World Scientific, 1985) are interpreted as standing waves or resonances of the helium liquid perpendicular to the substrate. Our interpretation is supported by microscopic calculations of the 4He dynamic structure function.

UR - https://www.scopus.com/pages/publications/0037979535

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EP - 607

JO - Journal of Low Temperature Physics

JF - Journal of Low Temperature Physics

IS - 5-6

ER -

An Interpretation of Dispersionless Modes in Neutron Diffraction Experiments on Helium Films

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