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Weiche Materie Poster: Do., 13:00–15:30 D-P352
Options for neutron backscattering spectroscopy on quasi-2D soft matter
systems
Tilo Seydel 1 , Maikel C. Rheinstädter 1 , Tim Salditt 2
1 Institut Laue-Langevin, B.P.156, F-38042 Grenoble – 2 Institut für Röntgenphysik,
Friedrich-Hund-Platz 1, D-37077 Göttingen
Neutrons unlike x-rays are severely limited in source brilliance, and thus experiments
concerning soft matter interfaces or quasi-twodimensional systems are often rendered
impossible by this restriction. If, however, a sufficient scattering volume can be achieved,
a wealth of new information can be obtained by high energy resolution neutron
spectroscopy. Here we discuss a recent example.
Experiments carried out on model lipid membrane bilayer systems using the neutron
backscattering technique [1-2] point to the new possibilities introduced by the
availability of adequate lipid membrane samples. These samples consist of stacks of
several thousand lipid membrane bilayers supported by silicon wafers. The mosaicity
of the membrane stack is smaller than approx. 0.5 ◦ . By the cold neutron backscattering
technique an energy resolution of 0.9 µeV FWHM can routinely be achieved whilst a
wavevector transfer range of approx. 0.02 ˚A −1