Violation of the Gaussian approximation in the incoherent inelastic spectrum of parahydrogen-deuterium quantum mixtures
In the proposed experiment two parahydrogen plus deuterium liquid mixtures (namely: c[p-H2]=30%, n=40.724 mol/l and c[p-H2]=50%, n=39.357 mol/l) will be investigated at T=20 K through incoherent inelastic neutron scattering on the chopper spectrometer IN4C using an incident wavelength of 1 Å, obtained employing the Cu (220) Bragg reflection. In addition, a pure normal deuterium sample (n=42.508 mol/l) will be also measured and used as a reference. The authors have a documented experience in the study of semi-quantum liquids and have recently proved the breakdown of the Gaussian approximation (i.e. the direct connection between the velocity auto-correlation function and self-dynamic structure factor) in pure liquid hydrogen. Now this study could represent a significant step forward in the knowledge of the applicability range and the limits of the Gaussian approximation, since the amount of D_2 modifies the self dynamics of H_2 in a highly non-trivial way, acting both on its pseudo-phononic and its diffusive parts in a tuneable way.
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COLOGNESI Daniele; BAFILE Ubaldo; CELLI Milva; FORMISANO Ferdinando and ORECCHINI Andrea. (2012). Violation of the Gaussian approximation in the incoherent inelastic spectrum of parahydrogen-deuterium quantum mixtures. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.6-02-499
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