TIME-DIFFERENTIAL RADIOFREQUENCY MUON SPIN-RESONANCE (TD-RF-MU-SR) TECHNIQUE AT A PULSED MUON BEAM

Longitudinal-field mu SR methods, e.g., radio-frequency mu(+) spin res onance (RF mu SR), are well suited to investigate dynamic processes th at destroy the phase coherence of the muon spin ensemble. Additional i nformation on relaxation processes of the muon species under investiga tion is obtained from time-differential (TD) data acquisition. In this paper we describe the set-up of a TD-RF mu SR spectrometer installed at the ISIS pulsed muon facility at the Rutherford Appleton Laboratory (RAL, Chilton, UK). As an example, results of TD-RF mu SR measurement s on muons in diamagnetic environment mu(d) in a boron-doped silicon s ample under illumination at 55 K are presented.