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Quadrature detection modifications and a microcell arrangement are described for the Varian XL-100 NMR spectrometer which routinely improve sensitivity in 13C Fourier transform sample-limited studies by a factor of 4–5. The power requirement of the rf pulse amplifier is relaxed by a factor of 4. Previously attainable resolution is not affected.
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Wilson et al. (1974) studied this question.
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