The paper discusses the three methods of using a resonant cavity for microwave spectroscopic measurements, in terms of sensitivity and the ability to discriminate between absorption and dispersion. The experimental results obtained confirm this analysis. The theory for the equivalent modes of waveguide cell operation is also derived and is extended to the travelling-wave helix which is now beginning to be used in double-resonance spectroscopy.
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Wilmshurst et al. (1962) studied this question.
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