Magnetic, Thermal, and Optical Properties of theFCenter in NaH

Abstract

Thermal and optical bleaching and microwave saturation effects on the isotropic resolved electron paramagnetic resonance hyperfine structure of the $F$ center in NaH have been studied. The results indicate that the thermal bleaching is a monomolecular process with an associated activation energy ${\ensuremath{\epsilon}}_{F}=0.38$ ev. A model similar to the print-out effect in silver halides is proposed for the bleaching mechanism. The wave-length of maximum optical absorption is 3.22 ev. The value of the characteristic spin relaxation time ${({T}_{1}{T}_{2})}^{\frac{1}{2}}$ is 1.7\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}6}$ second. The $g$ value for the $F$-center electron is 2.0025\ifmmode\pm\else\textpm\fi{}0.0003.