Abstract
We propose a simple explanation for the marked difference in the spectral shapes of the dielectric and the depolarized light scattering susceptibilities of the fragile molecular glassforming liquids: it is the direct consequence of the probing of the same molecular orientational dynamics through techniques having different tensorial properties. We deduce a relationship between the corresponding nonergodicity parameters which is well verified in molecular dynamics simulations available so far. We also show that the corresponding orientational susceptibilities of the NO −3 -ions in the glassformer CKN, obtained in a recent simulation, exhibit the same spectral difference as in the molecular liquids.
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Dedicated to Professor Wolfgang Götze on the occasion of his 60th birthday
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Lebon, M., Dreyfus, C., Guissani, Y. et al. Light scattering and dielectric susceptibility spectra of glassforming liquids. Z. Phys. B 103, 433–439 (1997). https://doi.org/10.1007/s002570050397
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DOI: https://doi.org/10.1007/s002570050397