Enhancement of nuclear modulation in electron spin echoes at low magnetic fields: S-band ESE spectrometer
✍ Scribed by R.B. Clarkson; M.D. Timken; D.R. Brown; H.C. Crookham; R.L. Belford
- Publisher
- Elsevier Science
- Year
- 1989
- Tongue
- English
- Weight
- 303 KB
- Volume
- 163
- Category
- Article
- ISSN
- 0009-2614
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✦ Synopsis
Most electron spin echo (ESE) experiments are performed at X-band ( 4 9 GHz) microwave frequencies. Just as in cw EPR, however, a multifrequency approach to ESE spectroscopy provides a more accurate determination of spin Hamiltonian parameters. The use of lower microwave frequencies (fields) in ESE experiments is expected to be particularly useful for enhancement of electron spin echo envelope modulation (ESEEM) depth for weakly coupled nuclei. Therefore, a pulsed EPR spectrometer was constructed to operate at Sband (2-4 GHz). Comparisons of vitrinite, perylene cation, irradiated quartz, and complexed Gd(lII) ESEEM patterns at X-and S-band illustrate the expected modulation depth enhancement.