Nature of the non-exponential primary relaxation in structural glass-formers probed by dynamically selective experiments

Several experimental methods feature the potential to distinguish between slow and fast contributions to the non-exponential, ensemble averaged primary response in glass-forming materials. Some of these techniques are based on the selection of subensembles using multi-dimensional nuclear magnetic re...

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Bibliographic Details
Published in:Journal of non-crystalline solids 1998-08, Vol.235, p.1-9
Main Authors: Böhmer, R., Chamberlin, R.V., Diezemann, G., Geil, B., Heuer, A., Hinze, G., Kuebler, S.C., Richert, R., Schiener, B., Sillescu, H., Spiess, H.W., Tracht, U., Wilhelm, M.
Format: Article
Language:English
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Summary:Several experimental methods feature the potential to distinguish between slow and fast contributions to the non-exponential, ensemble averaged primary response in glass-forming materials. Some of these techniques are based on the selection of subensembles using multi-dimensional nuclear magnetic resonance, optical bleaching, and non-resonant spectral hole burning. Others, such as the time-dependent solvation spectroscopy, measure microscopic responses induced by local perturbations. Using several of these methods it could be demonstrated for various glass-forming materials that the non-exponential relaxation results from a superposition of dynamically distinguishable entities. The experimental observation that subensembles can be selected efficiently indicates a large degree of heterogeneity. The intrinsic response is compatible with single exponential relaxation.
ISSN:0022-3093
1873-4812
DOI:10.1016/S0022-3093(98)00581-X