Radio-frequency μSR experiments at the ISIS pulsed muon facility |
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Authors: | S P Cottrell S F J Cox J S Lord C A Scott |
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Institution: | 1. ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxon, UK 2. Department of Physics, University College London, London, UK
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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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