ISIS Neutron and Muon Source Data Journal

Thermal excitations in helium as a function of temperature and pressure

Abstract: The low energy roton-phonon excitations have been studied extensively in helium. However, the spectrum at thermal energies has not been characterised. With the development of high pressure time of flight inelastic neutron scattering measurements using helium as the pressure transmitting medium, it is clear that the excitations arising from the helium are of vital significance to understanding the excitations in the actual samples being studied. We have observed this to be the case in our previous measurements on Ammonium Sulfate, in which a strong signal was attributed to the helium. To accurately analyse that data it is vital that we obtain a model for the helium excitations. These results therefore are essential for the PhD work of ISIS funded student Bernet Meijer, and will be of great use to the wider user community.

Principal Investigator: Dr Anthony Phillips
Local Contact: Dr Helen Walker
Experimenter: Miss Bernet Meijer
Experimenter: Dr Christian Balz

DOI: 10.5286/ISIS.E.RB2000238

ISIS Experiment Number: RB2000238

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 Anthony Phillips et al; (2021): Thermal excitations in helium as a function of temperature and pressure, STFC ISIS Neutron and Muon Source, https://doi.org/10.5286/ISIS.E.RB2000238

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