Paramagnetic resonance and optical spectra of divalent iron in cubic fields. II. experimental results

The paramagnetic resonance absorption of Fe2+ in MgO is observed at g=3.428and 6.86. The optical absorption line is found at 10 000 cm-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 μ and 0.7 μ. Possible explanations of this spectrum are discussed. A short discussion of the optical absorption spectra of trivalent iron in MgO is presented.