Journal Article

PreJuSER-50476

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Unexpected effect of internal degrees of freedom on transverse phonons in supercooled liquids

Patkowski, A. ; Gapinski, J. ; Meier, G.FZJ* ; Kriegs, H.FZJ* ; Le Grand, A. ; Dreyfus, C.

2006
EDP Sciences Les Ulis

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Please use a persistent id in citations: http://hdl.handle.net/2128/22926  doi:10.1209/epl/i2005-10429-y

Abstract: We show experimentally that in a supercooled liquid composed of molecules with internal degrees of freedom the internal modes contribute to the frequency-dependent shear viscosity and damping of transverse phonons, which results in an additional broadening of the transverse Brillouin lines. Earlier, only the effect of internal modes on the frequency-dependent bulk viscosity and damping of longitudinal phonons was observed and explained theoretically in the limit of weak coupling of internal degrees of freedom to translational motion. A new theory is needed to describe this new effect. We also demonstrate that the contributions of structural relaxation and internal processes to the width of the Brillouin lines can be separated by measurements under high pressure.

Keyword(s): J

Note: Record converted from VDB: 12.11.2012

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Contributing Institute(s):

1. Weiche Materie (IFF-IWM)

Research Program(s):

1. Kondensierte Materie (P54)

Appears in the scientific report 2006

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Database coverage:
; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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