Abstract
This paper explores the use of pulsed radio-frequency (RF) techniques to remove the frequency limitations imposed on conventional transverse muon spin rotation (μSR) experiments at a pulsed muon source by the finite muon pulse width. The implementation of the 90° pulse technique is demonstrated by observing the free precession signal of diamagnetic muons implanted in polythene, the change in signal amplitude as a function of RF pulse length is plotted and the precise condition for a 90° pulse determined. The technique is evaluated by comparing measurements made using conventional spin rotation experiments to those employing pulsed RF methods. The potential for applying standard NMR multiple-pulse methods to the μSR experiment is considered and the use of two-pulse RF sequences (90° x −τ−90° x and 90° x −τ−180° x ) to form a muon spin echo demonstrated.
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Cottrell, S.P., Cox, S.F.J., Lord, J.S. et al. Radio-frequency μSR experiments at the ISIS pulsed muon facility. Appl. Magn. Reson. 15, 469–476 (1998). https://doi.org/10.1007/BF03162029
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DOI: https://doi.org/10.1007/BF03162029