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Molecular dynamics in perfluoro-n-eicosane. III. Oscillatory and diffusive translational motion

Albrecht, T. and Jaeger, R. and Petry, W. and Steiner, R. and Strobl, G. and Stühn, B. (1991):
Molecular dynamics in perfluoro-n-eicosane. III. Oscillatory and diffusive translational motion.
95, In: Journal of Chemical Physics, (4), pp. 2817-2822, [Article]

Abstract

The translational motion of C20F42 helices is investigated using a combination of x-ray scattering and coherent quasielastic and inelastic neutron scattering techniques. In phase I, the helices are ordered with respect to their orientation and the dominating mode of motion is an acoustic phonon. In the high temperature phase R, the helices are disordered with respect to their longitudinal position and the angle of rotation around their main axis. Neutron scattering reveals for the longitudinal disorder a wide spectrum of relaxation times (10(-12)-10(-9) s). The rotational ordering of the helices leads to increased correlations and a slowing down in the diffusive longitudinal dynamics already above the phase transition.

Item Type: Article
Erschienen: 1991
Creators: Albrecht, T. and Jaeger, R. and Petry, W. and Steiner, R. and Strobl, G. and Stühn, B.
Title: Molecular dynamics in perfluoro-n-eicosane. III. Oscillatory and diffusive translational motion
Language: English
Abstract:

The translational motion of C20F42 helices is investigated using a combination of x-ray scattering and coherent quasielastic and inelastic neutron scattering techniques. In phase I, the helices are ordered with respect to their orientation and the dominating mode of motion is an acoustic phonon. In the high temperature phase R, the helices are disordered with respect to their longitudinal position and the angle of rotation around their main axis. Neutron scattering reveals for the longitudinal disorder a wide spectrum of relaxation times (10(-12)-10(-9) s). The rotational ordering of the helices leads to increased correlations and a slowing down in the diffusive longitudinal dynamics already above the phase transition.

Journal or Publication Title: Journal of Chemical Physics
Volume: 95
Number: 4
Divisions: 05 Department of Physics
05 Department of Physics > Institute for condensed matter physics
Date Deposited: 26 Feb 2010 13:33
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