| Issue |
Europhys. Lett.
Volume 43, Number 5, September I 1998
|
|
|---|---|---|
| Page(s) | 546 - 551 | |
| Section | Condensed matter: structure, thermal and mechanical properties | |
| DOI | https://doi.org/10.1209/epl/i1998-00395-x | |
| Published online | 01 September 2002 | |
Light scattering by low-frequency excitations in quasi-periodic n-alkane/urea adducts
1
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
Received:
30
April
1998
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
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