2H-NMR studies of supercooled and glassy aspirin

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dc.contributor.authorBöhmer, Roland
dc.contributor.authorNath, R.
dc.contributor.authorGeil, B.
dc.contributor.authorNowaczyk, A.
dc.date.accessioned2008-06-11T15:44:03Z
dc.date.available2008-06-11T15:44:03Z
dc.date.issued2007
dc.description.abstractAcetyl salicylic acid, deuterated at the methyl group, was investigated using 2H NMR in its supercooled and glassy states. Just above the glass transition temperature the molecular reorientations, studied using stimulated-echo spectroscopy, demonstrated a large degree of similarity with other glass formers. Deep in the glassy phase the NMR spectra look similar to those reported for the crystal and below 20 K they are indicating that rotational tunneling plays a role. Measurements of the spin-lattice relaxation times for temperatures below 150 K reveal a broad distribution of correlation times in the glass. The dominant energy barrier characterizing the slow-down of the methyl group motion is significantly lower than the well-defined barrier in the crystal.en
dc.identifier.citationNath, R.; Geil, B.; Nowaczyk, A.; Böhmer, R.: 2H-NMR studies of supercooled and glassy aspirin. In: Journal of Non-Crystalline Solids Nr. 41-43, Jg. 353(2007), S. 3788-3795, doi: 10.1016/j.jnoncrysol.2007.05.180.de
dc.identifier.doi10.1016/j.jnoncrysol.2007.05.180
dc.identifier.urihttp://hdl.handle.net/2003/25506
dc.identifier.urihttp://dx.doi.org/10.17877/DE290R-2964
dc.identifier.urlhttp://dx.doi.org/10.1016/j.jnoncrysol.2007.05.180
dc.language.isoende
dc.publisherElsevierde
dc.rightsCopyright © 2007 Elsevier B.V. All rights reserved.en
dc.subjectGlass transitionen
dc.subjectNuclear magnetic (and quadrupole) resonanceen
dc.subject.ddc530
dc.title2H-NMR studies of supercooled and glassy aspirinen
dc.typeTextde
dc.type.publicationtypearticlede
dcterms.accessRightsrestricted

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