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  Raman spectra and microscopic dynamics of bulk and confined salol

Kalampounias, A. G., Kirillov, S. A., Steffen, W., & Yannopoulos, S. N. (2003). Raman spectra and microscopic dynamics of bulk and confined salol. Journal of Molecular Structure, 651-653, 475-483.

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Kalampounias, A. G., Author
Kirillov, S. A., Author
Steffen, W.1, Author           
Yannopoulos, S. N., Author
Affiliations:
1MPI for Polymer Research, Max Planck Society, ou_1309545              

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 Abstract: In this paper we employ a new method, which enables one to calculate time correlation functions of vibrational relaxation by fits in the frequency domain, in the study of picosecond vibrational dynamics, that is, vibrational dephasing and vibrational frequency modulation. This method is applied to the molecular glass former salol in bulk, in a dilute CCl4 solution and in restricted geometries after confining it in nanoporous silica glasses of various pore sizes. The important finding is that the vibrational dynamics of the confined molecules becomes faster with decreasing the pore size. An attempt is made to rationalize this effect by invoking the cooperativity issue related to the sluggish dynamics as the glass transition is approached. The removal of many-body effects by trapping the molecules in less-crowded environments seems to be the key factor. The obtained results are described in the light of recent spectroscopic, X-ray diffraction and molecular dynamics studies performed on this liquid.

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Language(s): eng - English
 Dates: 2003
 Publication Status: Issued
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 Rev. Type: -
 Identifiers: eDoc: 42796
Other: P-03-36
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Title: Journal of Molecular Structure
Source Genre: Journal
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Pages: - Volume / Issue: 651-653 Sequence Number: - Start / End Page: 475 - 483 Identifier: -