| Автор | H. C. Hsueh |
| Автор | H. Vass |
| Автор | F. N. Pu |
| Автор | S. J. Clark |
| Автор | W. C. K. Poon |
| Автор | J. Crain |
| Дата выпуска | 1997-04-10 |
| dc.description | The nature of low-frequency (0 to 200 cm<sup>−1</sup>) dynamics of liquid crystal molecules is explored using a combination of high-resolution Raman spectroscopy and first principles computer simulations implemented on a parallel computer. The frequencies and displacement patterns associated with these vibrations have been determined by diagonalisation of a dynamical matrix. Results indicate that in the prototypical nematogen 5CB, complex internal modes have frequencies comparable to those of lattice modes in the low-temperature solid polymorphs. We expect this result is not specific to 5CB and that such behaviour is common to many liquid-crystal systems. Such low-frequency modes may be related to the conformational changes which have been observed to occur near liquid crystalline phase transitions. In smectic 8CB, very low-frequency features (near 10 cm<sup>−1</sup>) in the Raman spectrum are observed and are attributed to interlayer interactions in the smectic phase. |
| Формат | application.pdf |
| Издатель | Institute of Physics Publishing |
| Копирайт | 1997 EDP Sciences |
| Название | Low-frequency dynamics of liquid crystals |
| Тип | lett |
| DOI | 10.1209/epl/i1997-00209-3 |
| Electronic ISSN | 1286-4854 |
| Print ISSN | 0295-5075 |
| Журнал | EPL (Europhysics Letters) |
| Том | 38 |
| Первая страница | 107 |
| Последняя страница | 112 |
| Выпуск | 2 |
