| Using the Bloch equations, Ernst and Anderson made a study of the conditions under which Fourier transformation (FT) of the free induction decay (FID) could provide spectral information in a more efficient way than observation of a "normal" field or frequency sweep versus time (CW). They showed that for equivalent signal/noise the FT method provides a saving in time over the CW method of approximately {entire spectral range}/{typical spectrum linewidth}. Thus the time to record the spectrum is independent of the width of the spectrum. | R.R.Ernst and W.A.Anderson, Reviews of Scientific Instruments, 1966, 37, 93 |
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However, the pioneering work in pulsed EPR was carried out by Bill Mims, starting in 1958. This followed Erwin Hahn's first pulse NMR experiment in 1950. |
W.B.Mims, Electron Spin Echoes, Chapter 4 in Electron Paramagnetic Resonance, Ed S.Gerschwind, Plenum, New York, 1972 |