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A method is described for the measurement of high resolution spectra of dilute spins in solids. It is a pulsed nuclear double resonance technique which uses the spin system to perform an analogue Fourier transform. Results on the 1.108% abundant 13 C resonance in solid adamantane (C 10 H 16 ) show a resolved doublet with a splitting of (36+or-5) Hz or (9.5+or-1.3) ppm and a residual linewidth of about 20 Hz.
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Mansfield et al. (1972) studied this question.
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