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\ifmmode\times\else\texttimes\fi{}${10}^{17}$ and 2.3\ifmmode\times\else\texttimes\fi{}${10}^{18}$ electrons/${\mathrm{cm}}^{3}$, respectively. The spin-lattice relaxation time at room temperature of the $F$-center electrons is found to be 1.7 microseconds.

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