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Nature of nonexponential loss of correlation above the glass transition investigated by multidimensional NMR

Schmidt-Rohr, K., Spiess, H. W.·1991·Physical Review Letters

Abstract

A two-dimensional (2D) and a novel ``reduced four-dimensional (4D)'' exchange NMR experiment are applied to investigate slow dynamics in poly(vinyl acetate) 20 K above its ${\mathit{T}}_{\mathit{g}}$. The 2D $^{13}\mathrm{C}$ NMR spectra indicate a diffusive process with strongly nonexponential loss of correlation. In the ``reduced 4D'' experiment, the underlying distribution of correlation times is found to be heterogeneous on the time scale of the average correlation time, becoming homogeneous, however, at later times due to fluctuations which are 2 orders of magnitude slower.

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Metadata

Authors
Schmidt-Rohr, K., & Spiess, H. W.
Venue
Physical Review Letters
Published
1991-06-10
Volume
66
Issue
23
Pages
3020-3023
ISSN
0031-9007 (ISSN-L)
OpenAlex
W2034875509
Cited by
645
References
1
FWCI
18.41
Type
journal article
Language
en
Open access
closed

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CoChat. (2026). Citation check: Nature of nonexponential loss of correlation above the glass transition investigated by multidimensional NMR. https://app.cochat.ai/papers/10.1103/physrevlett.66.3020
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Schmidt-Rohr, K., & Spiess, H. W. (1991). Nature of nonexponential loss of correlation above the glass transition investigated by multidimensional NMR. Physical Review Letters. https://doi.org/10.1103/physrevlett.66.3020

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