Abstract
The electronic absorption spectra of the f ← f transitions of Ho3+ in solid and molten Cs2NaHoCl6 elpasolite and in Y(Ho)Cl3 have been measured from room temperature up to above the melting point of both compounds. Emphasis is given on the ligand field spectra of the 5G6 ← 5I8 hypersensitive transition. Smooth spectra changes are observed upon melting the solids. In conjuction with Raman spectroscopic measurements the absorption spectra are attributed to HoCl 3− 6 octahedra in distorted geometries. The spectra of molten Y(Ho)Cl3 are correlated to the elpasolite spectra as well as with the spectra of La(Ho)Cl3 and Gd(Ho)Cl3 to deduce the possible structure of the host rare-earth chlorides.
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