Issue |
Europhys. Lett.
Volume 44, Number 5, December I 1998
|
|
---|---|---|
Page(s) | 565 - 570 | |
Section | General | |
DOI | https://doi.org/10.1209/epl/i1998-00510-7 | |
Published online | 01 September 2002 |
Four-time rotational correlation functions
Institut für Physikalische Chemie, Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany
Received:
2
July
1998
Accepted:
5
October
1998
A scheme to analyze four-time rotational correlation functions of any rank is developed and details for rank L=1 and 2 are given. The scheme provides a transparent way for identifying deviations from simple Markovian dynamics as observed, e.g., in complex liquids close to the glass transition. The method should be applicable to NMR and optical multiple-pulse techniques as well as to photon correlation spectroscopy. Results are given for 2H-NMR multiple-pulse data in supercooled glycerol. We identify and analyze the dynamical heterogeneity of molecular reorientation in a range of close to the glass temperature .
PACS: 05.40.+j – Fluctuation phenomena, random processes, and Brownian motion / 61.20.Lc – Time-dependent properties; relaxation / 64.70.Pf – Glass transitions
© EDP Sciences, 1998
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