Paramagnetic Resonance and Optical Spectra of Divalent Iron in Cubic Fields. II. Experimental Results

Abstract

The paramagnetic resonance absorption of ${\mathrm{Fe}}^{2+}$ in MgO is observed at $g=3.428 \mathrm{and} 6.86$. The optical absorption line is found at 10 000 ${\mathrm{cm}}^{\ensuremath{-}1}$. The paramagnetic resonance spectrum indicates considerable covalent bonding. The origin of the line at 6.86 is discussed.In tetrahedral ZnS a paramagnetic line is found at $g=2.25$ and optical absorption at 3 \ensuremath{\mu} and 0.7 \ensuremath{\mu}. Possible explanations of this spectrum are discussed.A short discussion of the optical absorption spectra of trivalent iron in MgO is presented.