8th Liquid Matter Conference September 6-10, 2011 Wien, Austria ...

Tue 611:23-14:00P2.11High-resolution tandem Fabry-Perot interferometer forUltra-Violet Brillouin scattering measurementsAndrea Battistoni, 1 Filippo Bencivenga, 2 Daniele Fioretto, 3 and ClaudioMasciovecchio 21 Department of Physics, University of Trieste, Piazza Europa, 34127, Trieste,Italy2 Sincrotrone Trieste S. C. p. A. , Trieste, Italy3 Physics department, University of Perugia, Perugia, ItalyWe present the features of a new high-resolution tandem Fabry-Perot interferometer for Ultra-Violet (UV) Brillouin scattering measurements. The use of this new table top setup, equipped witha tunable scattering angle, enables us to investigate the momentum-energy ( Q - E ) region between10 −2 and 10 −1 nm −1 , and between 10 −3 and 10 −2 meV, previously accessible only by large scalefacilities. Dissipation of longitudinal acoustic modes as a function of Q and E is reported, givinginformation on relaxation of density fluctuations in prototypical liquids, like water, glycerol andwater-peptide solutions.11