Low-frequency dynamics of liquid crystals
學年 85
學期 1
出版（發表）日期 1997-01-01
作品名稱 Low-frequency dynamics of liquid crystals
作品名稱（其他語言）
著者 Hsueh, H. C.; H. Vass; F. N. Pu; S. J. Clark; W. C. K. Poon; J. Crain
單位
出版者
著錄名稱、卷期、頁數 EUROPHYSICS LETTERS 38(2), pp.107-112
摘要 The nature of low-frequency (0 to 200 cm−1) 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−1) in the Raman spectrum are observed and are attributed to interlayer interactions in the smectic phase.
關鍵字
語言 en
ISSN
期刊性質 國外
收錄於
產學合作
通訊作者
審稿制度 0
國別 GBR
公開徵稿
出版型式 ,電子版,紙本
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