Springer LINK: The European Physical Journal B - Abstract Volume 5 Issue 2 (1998) pp 231-236

The European Physical Journal B

ISSN: 1434-6028 (printed version)
ISSN: 1434-6036 (electronic version)

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Abstract Volume 5 Issue 2 (1998) pp 231-236

Wavenumber dependence of structural $\alpha$ relaxation in a molecular liquid

A. Tölle (1) (a), J. Wuttke (2), H. Schober (3), O.G. Randl (3) (b), F. Fujara (1)

(1) Fachbereich Physik, Universität Dortmund, 44221 Dortmund, Germany
(2) Physik-Department, Technische Universität München, 85747 Garching, Germany
(3) Institut Laue-Langevin, 38042 Grenoble, France

Received: 5 January 1998 / Revised: 3 April 1998 / Accepted: 19 June 1998

Abstract: Structural $\alpha$ 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, $\alpha$ relaxation remains non-exponential.

PACS. 61.20.Lc Relaxations, time dependent properties - 61.25.Em Molecular liquids - 61.12.-q Neutron diffraction and scattering

(a) email: albert@fuj.physik.uni-dortmund.de
(b) Present address: Michelin, place des Carmes, 63040 Clermont-Ferrand, France.

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