LONGITUDINAL MUON SPIN RELAXATION IN MUONIUM-LIKE SYSTEMS

Nuclear spin-lattice relaxation in paramagnetic systems is treated usi ng the classic expression for transition probability between the coupl ed electron and nuclear spin states. The rate equations governing the incoherent occupancies of these states are solved analytically (where possible) and numerically (where not) to construct the relaxation func tion for the nuclear spin. The method is illustrated for muonium, and the muonium-substituted molecular radicals, for the case of perturbati on due to fluctuation of the local field, i. e. modulation of the inte raction with a third spin. A slight departure from single exponential behaviour is demonstrated for slow fluctuations.