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Journal Article

Decay of single and double quantum coherences in deuterated glassy ortho-terphenyl

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Zimmermann,  Herbert
Department of Molecular Physics, Max Planck Institute for Medical Research, Max Planck Society;
Department of Biomolecular Mechanisms, Max Planck Institute for Medical Research, Max Planck Society;

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Citation

Kircher, O., Diezemann, G., Böhmer, R., Hinze, G., Schug, K. U., Sillescu, H., et al. (1998). Decay of single and double quantum coherences in deuterated glassy ortho-terphenyl. The Journal of Chemical Physics, 108(20), 8550-8556. doi:10.1063/1.476284.


Cite as: http://hdl.handle.net/11858/00-001M-0000-002B-9DB3-D
Abstract
he decay of single and double quantum coherences in amorphous ortho-terphenyl is studied by means of deuteron NMR echo experiments near and below the calorimetric glass transition temperature Tg. In perdeuterated samples a Gaussian decay for these coherences is found at low temperatures, in accord with theoretical predictions for random local dipolar fields. A method is proposed to extract information about slow motional processes from ordinary solid echo experiments below Tg. Partly deuterated ortho-terphenyl does not show a Gaussian decay. Simple model calculations show that this observation indicates the importance of correlations of the local dipolar fields in the presence of protons.