Dresden 2014 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 53: Topical session: X-ray and neutron scattering in materials science II - Atomic migration studies ranging from neutrons to coherent X-rays
MM 53.4: Vortrag
Donnerstag, 3. April 2014, 12:45–13:00, BAR 205
Microscopic structure of supercooled water studied by x-ray Compton scattering — •Juri Nyrow1, Felix Lehmkühler2, Mikko Hakala3, Thomas Büning1, Ingo Steinke2, Agnieszka Poulain4, Thomas Buslaps4, Metin Tolan1, and Christian Sternemann1 — 1Fakultät Physik/DELTA, Technische Universität Dortmund, 44221 Dortmund, Germany — 2Deutsches Elektronen-Synchrotron DESY, 22607 Hamburg, Germany — 3Department of Physics, University of Helsinki, FI-00014 Helsinki, Finland — 4ESRF, 38043 Grenoble Cedex 9, France
The structure of the hydrogen bond network of water at ambient and in supercooled conditions is controversially discussed, e.g. with respect to a mixture of two phases, LDW (low density water) and HDW (high density water). HDW and LDW phases differ fundamentally in respect of the local structure, with the high density phase showing a highly disturbed OH bonding network and the low density phase showing a nearly tetrahedral coordinated water network. Recently inelastic neutron scattering studies reported a disturbance of the water network at slight supercooling. We investigated changes in the local molecular structure in supercooled water for temperatures down to 256 K by x-ray Compton scattering and found evidence for structural changes which will be discussed on the basis of different structure models.