Electron Spin Echo and Millimeter Wave Epr Studies of Disordered Solids
Electron spin echo (ESE) spectroscopy has been used in the first section of this study to measure weak nitrogen hyperfine coupling in a series of pyridine derivatives loosely bound to bis(benzoylacetonato)copper (Cu(benzac)$\sb2$) in solution. The ESE technique has also been employed to study weak, long range, unresolved, (matrix) hyperfine interactions in coal. Experimentally, electron nuclear double resonance (ENDOR) and continuous wave electron paramagnetic resonance (cw EPR) techniques are better suited to study strong short range ($$35 GHz) experiments should result in enhanced resolution or allow for more accurate determinations of the zero-field splitting energies in a high spin system. Single crystal spectra as well as doped powder spectra of a variety of copper and iron model compounds were examined using millimeter wave EPR. The exploratory experiments, performed at 4.2 K, made use of neither a sample cavity nor field modulation methods. Even so, the combination of low temperature and high field made it possible to record spectra in single scans.
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