F. Affouard, Y. Guinet, T. Denicourt
Aug 2, 2001
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Influential Citations
17
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Journal
Journal of Physics: Condensed Matter
Abstract
Raman scattering experiment and molecular dynamics simulation have been performed on orientationally disordered crystal chloroadamantane. This investigation shows clear indication for a change of vibrational dynamics in the frequency range (2 cm-1-230 cm-1) at the temperature Tx corresponding to the onset of non-exponential relaxation and consistent with previous NMR and MD studies. This allows us to support the existence of a `landscape-influenced' regime above the critical temperature Tc of the mode coupling theory. Convincing experimental evidence of local orientational ordering which can be nicely probed from the so-called bending mode of the chloroadamantane molecule are also given.