EPR STUDIES OF ELECTRONS TRAPPED IN SODIDES

The EPR spectra of six sodides of known structure reveal that excess electrons in these salts are trapped at vacant anionic sites and can be considered similar to F centers. Hyperfine splitting is observed when the complexed cation is exposed to the anionic site, but not when the cation is well-shielded by inclusion in a sandwich structure formed by two crown ether molecules. The g values, T1e relaxation times, hyperfine splittings, and dependence of intensities on temperature are reported and discussed.