Magnetism of KCl

At room temperature KCl has a diamagnetic susceptibility of 1.04×${10}^{-6\mathrm{}}$ cgs units per ${\mathrm{cm}}^3$. The value at liquid nitrogen temperatures is ½% smaller. As the temperature is lowered further, a paramagnetic contribution inversely proportional to the temperature becomes apparent in additively or gamma-ray colored material. The magnitude of this paramagnetic contribution, which is proportional to the number of one-electron imperfection centers, is compared to the optical absorption of electron excess centers, to yield a value of 0.6 for the oscillator strength of the $F$ band, and strong evidence that the $M$ center is not paramagnetic. The results also indicate that the $M$ center absorbs under the $F$ band as well as in the $M$ band.