Measurement ofF-Center Concentration and Relaxation Time by Microwave Faraday Rotation

Abstract
The use of a bimodal cavity for the observation of electron spin resonance is described. The two samples of NaCl containing F centers used by Blumberg are investigated by electron spin resonance. Their F-center concentrations are found to be 4.4×1017 and 2.3×1018 electrons/cm3, respectively. The spin-lattice relaxation time at room temperature of the F-center electrons is found to be 1.7 microseconds.