Abstract
A pulsed optically detected magnetic resonance spectrometer has been used to investigate time dependent recombination processes in ZnS and CdS. The detection of magnetic resonance by optical methods requires the observation of changes in the luminescence induced by microwaves at the resonant magnetic field. The pulsed system involves a two channel sample and hold unit with a digital phase-sensitive detector used with a pulsed nitrogen laser and either a magnetron or a kylstron plus travelling wave amplifier. The luminescence can be sampled with gatewidths variable down to 35 ns. The microwaves are pulsed at half the sampling rate so that the detector output is proportional to the microwave induced changes in the luminescence. In ZnS, separate donor and acceptor resonance are observed from distant pairs, whereas, for the shorter lived pairs, a new resonance corresponding to close-pair, excitonic, decay is detected. These time resolved resonance spectra and measurements of spin lattice relaxation times in CdS are reported.
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