Volume 43, Number 5, September I 1998
|Page(s)||546 - 551|
|Section||Condensed matter: structure, thermal and mechanical properties|
|Published online||01 September 2002|
Light scattering by low-frequency excitations in quasi-periodic n-alkane/urea adducts
Groupe Matière Condensée et Matériaux, URA CNRS 804,
Université de Rennes
I, Campus de Beaulieu, Rennes 35042, France
2 Laboratoire de Spectroscopie Moléculaire et Cristalline, URA CNRS 124, Université de Bordeaux 1 - 351 cours de la Libération, 33405 Talence cedex, France
3 Departemento de Física de la Materia Condensada, Facultad de Ciencias, Universidad del Pais Vasco - Apdo 644, Bilbao, Spain
Accepted: 13 July 1998
High-resolution light scattering spectroscopy has been performed on a series of n-alkane /urea inclusion compounds with . The elastic constants of these incommensurate composite crystals have been determined and found to be independent of the chain length of the guest molecules. In addition, no extraneous acoustic-like mode appeared in all spectra. However, quasi-elastic components with different widths are observed for different polarizations. In one of them the characteristics of the scattered light suggest that the quasi-elastic broadening could be generated by a sliding mode, whereas the other detected component is assigned to the reorientational motions of the n-alkane chains about their long axis.
PACS: 61.44.Fw – Incommensurate crystals / 63.20.-e – Phonons in crystal lattices / 78.35.+c – Brillouin and Rayleigh scattering; other light scattering
© EDP Sciences, 1998
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.