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DY: Dynamik und Statistische Physik

DY 46: Poster

DY 46.133: Poster

Thursday, March 30, 2006, 16:00–18:00, P1

Guest-host interaction of deuterated THF molecules in clathrate hydrates — •Beata Walasek and Rudolf Feile — Institut für Festkörperphysik, Technische Universität Darmstadt, Hochschulstr. 8, 64289 Darmstadt

Recent investigations on molecular vibrations of tetrahydrofurane (THF) as guest molecule in the hydrate cages of the THF-clathrate hydrate revealed an inequivalent influence of the surrounding water molecules on two characteristic vibrations (C-C-C-C stretches and C-O-C stretch) compared to the THF molecule in liquid THF-water solution.

We have performed Raman scattering experiments on deuterated tetrahydrofurane (THF-d8) molecules in liquid THF-d8, in liquid mixtures of THF-d8 with H_2O/D_2O, and THF-d8-H_2O/D_2O-clathrates. The results give a more detailed knowledge about molecular vibrations of the fivefold ring of four carbon atoms and one oxygen atom and the THF-d8 interaction with H2O/D2O. Additionally, we get a more clear picture about the low temperature anomalies observed in THF-clathrates.