Autor(en): | Böhmer, Roland Kircher, O. Diezemann, G. Hinze, G. Schug, K. U. Sillescu, H. Zimmermann, H. |
Titel: | Decay of single and double quantum coherences in deuterated glassy ortho-terphenyl |
Sprache (ISO): | en |
Zusammenfassung: | The 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 |
Schlagwörter: | organic compounds glass transition spin echo (NMR) |
URI: | http://hdl.handle.net/2003/25709 http://dx.doi.org/10.17877/DE290R-3355 |
Erscheinungsdatum: | 1998-05-22 |
Provinienz: | American Institute of Physics |
URL: | http://dx.doi.org/ 10.1063/1.476284 |
Zitierform: | Kircher, O.; Diezemann, G.; Böhmer, R.; Hinze, G.; Schug, K. U.; Sillescu, H.; Zimmermann, H.: Decay of single and double quantum coherences in deuterated glassy ortho-terphenyl. In: Journal of Chemical Physics Nr. 20, Jg. 108(1998), S. 8550-8556, doi: 10.1063/1.476284. |
Enthalten in den Sammlungen: | Böhmer, Roland Prof. Dr. |
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