https://doi.org/10.1007/s100510050439
Wavenumber dependence of structural α relaxation in a molecular liquid
1
Fachbereich Physik,
Universität Dortmund, 44221 Dortmund, Germany
2
Physik-Department,
Technische Universität München, 85747 Garching, Germany
3
Institut Laue-Langevin, 38042 Grenoble, France
Corresponding author: a albert@fuj.physik.uni-dortmund.de
Received:
5
January
1998
Revised:
3
April
1998
Accepted:
19
June
1998
Published online: 15 September 1998
Structural α relaxation in liquid orthoterphenyl is studied by means of coherent neutron time-of-flight and backscattering spectroscopy over a large temperature range. Not only amplitude and relaxation time but also the spectral line shape show a significant variation with wavenumber. These variations are correlated with the static structure factor, in qualitative accord with mode-coupling results for simple liquids. Even far above the melting point, α relaxation remains non-exponential.
PACS: 61.20.Lc – Relaxations, time dependent properties / 61.25.Em – Molecular liquids / 61.12.-q – Neutron diffraction and scattering
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 1998
