We present a method which allows quasi-elastic neutron scattering (QENS) at multi-GPa pressures, i.e., pressure conditions which are an order of magnitude higher than possible with QENS till now. The technique uses an opposed-anvil geometry with a sample chamber in the form of a toroid which minimizes multiple scattering effects. This method has been applied to measurements of the self-diffusion coefficient of water at 400K up to 3 GPa. The results demonstrate the potential of this method for studying diffusion over a large pressure and temperature range. (C) 2013 AIP Publishing LLC.
Quasi-elastic neutron scattering in the multi-GPa range and its application to liquid water / Klotz, S.; Strässle, Th.; Bove, L. E.. - In: APPLIED PHYSICS LETTERS. - ISSN 0003-6951. - ELETTRONICO. - 103:19(2013), p. 193504. [10.1063/1.4828661]