The connection between fast and slow dynamics in glass-forming liquids: a test of the 'isomorph theory' of simple liquids.
The molecules in a liquid close to the glass transition move on a range of timescales. Vibrations take place on the picosecond timescale while relaxations can be as slow as minutes or hours. It has several times been suggested that there is a close connection between the fast and slow dynamics, even though they differ in time scales by ten or more orders of magnitude. The recently developed isomorph theory rationalizes this connection. The aim of this experiment is to measure fast dynamics (~ nanosecond) along lines in the phase diagram where the slow alpha relaxation is constant (so called isochrones), because the isomorph theory predicts that the fast relaxation should be invariant along these lines. The experiment requires measurements at elevated pressure, which is in itself interesting because relatively little INS/QENS high pressure data is available on glass-forming liquids.
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Kristine Niss; ALBA SIMIONESCO Christiane; Simone Capaccioli; Bernhard Frick; HECKSHER Tina; JAKOBSEN Bo and ROED Lisa. (2013). The connection between fast and slow dynamics in glass-forming liquids: a test of the 'isomorph theory' of simple liquids.. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.6-05-921
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