Dresden 2003 – wissenschaftliches Programm

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DY: Dynamik und Statistische Physik

DY 32: Glasses II (joined session FV DF/DY)

DY 32.2: Vortrag

Dienstag, 25. März 2003, 15:00–15:15, HSZ/403

Rotation-Dynamics in supercooled molecular liquids — •Maximilian Schultz and Thomas Franosch — Hahn-Meitner-Institut, Abteilung Theorie - SF5, Glienicker Str. 100, 14109 Berlin

In order to describe effects of depolarized light-scattering in supercooled molecular liquids one usually works with phenomenological constitutive equations. These have already been derived from a microscopic theory for the special case of linear, rigid molecules. This theory is reformulated for molecules of arbitrary shape. The equations of motion are derived via the Mori-Zwanzig method using projection operators on the space of dynamical observables. The memory kernels of the resulting generalised Langevin equations are given in a microscopically exact form. The dynamics in the hydrodynamic regime of the system, ie. small wavevectors q, can be described by expressions evaluated in the long wavelength limit. The equations of motion are solved and the results are compared to the theory of linear molecules.