Electron Echo Methods in Spin Resonance Spectrometry

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Abstract
The application of electron spin echo methods to spectrometry is discussed theoretically and illustrated with experimental examples. A pulsing and detection apparatus with a bandwidth of 8 Mc, constituting a relatively simple addition to a conventional X band cw spectrometer, is described. Computations have been made for the echo waveforms generated in the case where the microwave field intensity is of the same order as or less than the linewidth. The optimization of experimental conditions is considered, and an expression has been derived for the minimum number of spins detectable by the echo method. This is essentially the same as the number detectable by cw spectrometry at the same average power level and in the same time of observation. The general applicability of the method is limited by requirements regarding phase memory in the material studied. It is possible, however, that for some measurements, especially those involving broad lines, the echo method may possess advantages over cw spectrometry because of the fundamental difference in the way in which the resonance signal is obtained.
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