LOW TEMPERATURE ABSORPTION AND MAGNETIC CIRCULAR DICHROISM OF $Os^{4+}$ IN CUBIC HOSTS
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Date
1979
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Ohio State University
Abstract
Electronic d-d transitions within the $t_{2g}{^{4}}$ manifold of $Os^{4+}$ doped into cubic host crystals of $Cs_{2}ZrCl_{6}$ and $K_{2}PtCl_{6}$ were observed at $4^{\circ} K$ and $77^{\circ} K$ by means of absorption and magnetic circular dichroism measurement. The $A_{1g}(3T_{1g}) \rightarrow T_{2g} (^{1} T_{2g}), E_{g}(1_{Eg})$ transitions near $10000 cm^{-1}$ and the $A_{1g} (^{3}T_{1g}) \rightarrow T_{2g}, E_{g} (^{3}T_{2g})$ transitions near $5000 cm^{-1}$ were studied. Due to the close proximity of the electronic states, the spectra in both regions consists of overlapping vibronic bands. At $3000 cm^{-1}$ the magnetic dipole allowed origin of the $A_{1g} (^{3}T_{1g}) \rightarrow T_{1g} (^{3}T_{1g})$ was observed for the first time. By coupling hot band and vibronic analysis to the magnetic circular dichroism results, revised energy level assignments were made for these states. The experimental assignments were correlated with results from a complete ligand field calculation.
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