The electron-spin resonance of F centers in potassium iodide is observed at 293°K, 77°K, and 4°K. Addibvely-c~lored crystals of several concentrations and x-rayed crystals show the same resonance with g= 1.970 and a width of 213 gauss at maximum slope. The saturation of the absorption is measured. The resonances of F centers in potassium halides are compared.
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