Zero frequency resonance: another way to measure muon-electron hyperfine constants

At a magnetic field determined by the zero crossing of the ω 12 frequency of a paramagnetic species like a muonium-substituted radical some muons experience a total magnetic field of zero, simply because the hyperfine field exactly cancels the externally applied field. Since the muon polarization do...

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Bibliographic Details
Published inPhysica. B, Condensed matter Vol. 289; pp. 681 - 683
Main Authors Schüth, Joachim, Percival, Paul W, Addison-Jones, Brenda, Brodovitch, Jean-Claude, Ghandi, Khashayar
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.08.2000
Subjects
Hyperfine coupling
Time-integral μSR
μSR techniques
Time-integral μSR
μSR techniques
Hyperfine coupling
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Summary:At a magnetic field determined by the zero crossing of the ω 12 frequency of a paramagnetic species like a muonium-substituted radical some muons experience a total magnetic field of zero, simply because the hyperfine field exactly cancels the externally applied field. Since the muon polarization does not rotate under this condition, an integral positron asymmetry is seen even in transverse field if the resonance condition is met. Essentially, the same data acquisition set-up and high beam currents as used in other integral μSR techniques, such as ALCR, can be used to scan for the resonant field, which scales linearly with the hyperfine constant, A μ. A theoretical treatment of the resonances in the case of isotropic A μ is presented along with measured spectra demonstrating the technique.
ISSN:0921-4526
1873-2135
DOI:10.1016/S0921-4526(00)00310-0