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μ+e-Hyperfine Interactions in Quartz Crystals

Published online by Cambridge University Press:  15 February 2011

J.H. Brewer ,
D.G. Fleming  and
D.P. Spencer
J.H. Brewer
Affiliation:
Department of Physics, University of British Columbia, Vancouver, B.C., Canada, V6T 2A3
D.G. Fleming
Affiliation:
Department of Chemistry, University of British Columbia, Vancouver, B.C., Canada, V6T 1Y6
D.P. Spencer
Affiliation:
Department of Chemistry, University of British Columbia, Vancouver, B.C., Canada, V6T 1Y6
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Abstract

Longitudinal muonium spin relaxation/modulation in zero magnetic field (zf-MSR) has been used to study muonium (μ+e-) atoms in single-crystal α-quartz between 5 K and room temperature. At 6 K, three frequencies are observed, corresponding to a triaxial hyperfine matrix whose principal values are close to those observed for hydrogen atoms frozen into known sites. For intermediate temperatures the Mu atoms “hop” between sites, causing a relaxation whose rate first increases with the hop rate and then decreases due to motional narrowing. Finally, at room temperature, a single-frequency oscillation is observed, corresponding to a uniaxial motionally-averaged hyperfine interaction.

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References

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