O. Burghaus et Mp. Klein, COHERENT RAMAN BEAT AND ESEEM EPR SPECTROSCOPY APPLIED TO A TRANSITION-METAL COMPLEX - COMPARISONS OF SENSITIVITY AND SPECTRAL RESOLUTION, Chemical physics letters, 243(5-6), 1995, pp. 480-485
Coherent Raman beats (CRB) resulting from N-14 hyperfine interactions
have been observed in the EPR spectrum of the S = 1/2 state of a mixed
valence di-mu-oxo bridged Mn(III, IV) bipyridyl dimer at X-band (9 GH
z) and the results compared with those obtained from three-pulse elect
ron spin echo envelope modulation (ESEEM) data recorded under similar
conditions. The spectral resolution of the CRB data were approximate t
o 2-fold superior to the ESEEM while the signal-to-noise ratio was enh
anced by a factor of approximate to 40. The resolution improvement der
ives from the fact that the CRBs can persist for times approaching the
electron T-1 while the decay of the ESE envelope is limited by spectr
al diffusion. CRB detection benefits from a multiplex advantage relati
ve to ESEEM.