ISIS Neutron and Muon Source Data Journal

Violation of the Gaussian approximation in the incoherent spectrum of hydrogen-neon liquid mixtures

Abstract: A well-known approach to the self-dynamics of liquids is based on the Gaussian approximation, where it is assumed that the motion of a molecule is fully determined by a unique function of time directly related to the velocity auto-correlation function. Experimental inquiries into the presence of non-Gaussian dynamics are still scarce, particularly concerning low-temperature liquids exhibiting moderate quantum effects (i.e. H2, D2, and Ne). Though experimental evidences of the breakdown of the Gaussian approximation in liquid para-H2 (and in its isotopic mixtures with D2) have been recently obtained by the present authors, the density behavior of this phenomenon and its link with the self-diffusion coefficient are not completely understood. These two issues will be tackled by a new neutron investigation on three liquid para-H2/Ne mixtures exhibiting various hydrogen concentrations.

Principal Investigator: Dr Daniele Colognesi
Experimenter: Dr Leonardo del Rosso
Experimenter: Dr Ubaldo Bafile
Experimenter: Dr Milva Celli
Experimenter: Dr Eleonora Guarini
Local Contact: Dr Duc Le

DOI: 10.5286/ISIS.E.RB1610007

ISIS Experiment Number: RB1610007

Publisher: STFC ISIS Neutron and Muon Source

Data format: RAW/Nexus
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Data Citation

The recommended format for citing this dataset in a research publication is as:
[author], [date], [title], [publisher], [doi]

For Example:
Dr Daniele Colognesi et al; (2016): Violation of the Gaussian approximation in the incoherent spectrum of hydrogen-neon liquid mixtures, STFC ISIS Neutron and Muon Source, https://doi.org/10.5286/ISIS.E.RB1610007

Data is released under the CC-BY-4.0 license.