This paper discusses some factors which limit the sensitivity of microwave paramagnetic resonance equipments. Several specific systems are analyzed and the results verified by measuring the signal-to-noise ratio with known amounts of a free radical. The two most promising systems, especially at low powers, employ either superheterodyne detection or barretter homodyne detection. A detailed description of a superhetrodyne spectrometer is given.
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G. Fehér (1957) studied this question.
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