Correlation of the Optical and Electron-Spin-Resonance Absorptions of theHCenter in KCl

It has been shown that the optical $H$ band and the ESR $H$ spectrum arise from the same center, the $H$ center, in KCl. Similar to the ${\mathrm{Cl}}_2^{-}$ (or $V_K$) center, the $H$ center has two optical transitions: A strong and highly $\sigma$-polarized transition giving rise to an absorption band at 336 nm, and a much weaker transition, which is very weakly $\sigma$-polarized, giving rise to an absorption band at 522 nm. The disorientation temperature of the $H$ center has been found to be (10.9±0.3)°K.