ISIS Neutron and Muon Source Data Journal

Quantum tunnelling of muonium via radical states in molecular solids

Abstract: The extreme quantum nature of muons and muonium in condensed matter is the result of having a mass that is nine times lighter than that of a hydrogen atom. While this quantum nature may often be masked by thermal excitations, at low temperatures its dramatic effects can become more apparent. This was clearly demonstrated in solid state benzene ALC spectra below 120 K, where we have observed both intramolecular and intermolecular multisite quantum tunnelling of radical states. In this proposal we aim to use molecular engineering to control the sites available to form quantum tunneling states and we will use low temperature solid state ALC spectroscopy to confirm the effect of the different modifications we have made to our reference molecule. The modifications will take the form of selective substitutions of the benzene molecule and four different examples will be studied.

Principal Investigator: Dr Francis Pratt
Experimenter: Dr Leandro Liborio
Experimenter: Dr Benjamin Huddart
Experimenter: Dr Stephen Cottrell
Experimenter: Professor Tom Lancaster
Experimenter: Dr Matteo Aramini

DOI: 10.5286/ISIS.E.RB1820590

ISIS Experiment Number: RB1820590

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 Francis Pratt et al; (2018): Quantum tunnelling of muonium via radical states in molecular solids, STFC ISIS Neutron and Muon Source, https://doi.org/10.5286/ISIS.E.RB1820590

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