Coherent Raman beats (CRB) resulting from
14N hyperfine interactions have been observed in the EPR spectrum of the
S = state of a mixed valence di-μ-oxo bridged Mn(III, IV) bipyridyl dimer at X-band (9 GHz) and the results compared with those obtained from three-pulse electron spin echo envelope modulation (ESEEM) data recorded under similar conditions. The spectral resolution of the CRB data were
![](/images/glyphs/BQ4.GIF)
2-fold superior to the ESEEM while the signal-to-noise ratio was enhanced by a factor of
![](/images/glyphs/BQ4.GIF)
40. The resolution improvement derives from the fact that the CRBs can persist for times approaching the electron
T1 while the decay of the ESE envelope is limited by spectral diffusion. CRB detection benefits from a multiplex advantage relative to ESEEM.