Abstract
The authors use neutron scattering polarization analysis to extract the coherent and incoherent dynamic structure factors of heavy water with high resolution and in a wide range of scattering vectors. In the mesoscale, the observed decorrelation of the collective fluctuations hardly depends on the scattering vector, whereas in regions closer to intermolecular scales such independent mode coexists with diffusion.
Highlights
Coherent structural relaxation of water from meso- to intermolecular scales measured using neutron spectroscopy with polarization analysis
The first experimental investigations were carried out using inelastic neutron scattering [2,3], since the 1990s most studies were performed using inelastic x-ray scattering (IXS)
The current consensus is that the terahertz density fluctuations in water at the mesoscopic scale, and in particular the question of the acoustic propagation, can be explained in terms of a viscoelastic model
Summary
Coherent structural relaxation of water from meso- to intermolecular scales measured using neutron spectroscopy with polarization analysis. By means of the recent implementation of neutron polarization analysis on a wide-angle time-of-flight spectrometer, we have been able to separately measure coherent and incoherent dynamic structure factors of heavy water with sub-meV resolution in a wide scattering vector (Q) range.
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