Coherent Raman beat and ESEEM EPR spectroscopy applied to a transition metal complex: comparisons of sensitivity and spectral resolution
✍ Scribed by Olaf Burghaus; Melvin P. Klein
- Publisher
- Elsevier Science
- Year
- 1995
- Tongue
- English
- Weight
- 400 KB
- Volume
- 243
- Category
- Article
- ISSN
- 0009-2614
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✦ Synopsis
Coherent Raman beats (CRB) resulting from 14N hyperfine interactions have been observed in the EPR spectrum of the S = 1/2 state of a mixed valence di-lx-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 = 2-fold superior to the ESEEM while the signal-to-noise ratio was enhanced by a factor of = 40. The resolution improvement derives 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 spectral diffusion. CRB detection benefits from a multiplex advantage relative to ESEEM.