Far-infrared resonant model absorption by erbium impurities in CaF2

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Abstract
Using high-resolution far-infrared spectroscopy the vibrational properties of the Er3+-F- tetragonal complex in CaF2 has been studied at low temperatures. Three principal resonant peaks are observed in the absorption spectrum at 75.38, 91.6 and 107 cm-1. From polarization measurements on Er3+-F- dipoles aligned in a static electric field, the broad 107 cm-1 peak is found to consist of two components centred at 106 and 109 cm-1, corresponding to vibrations of the Er3+ ion parallel and perpendicular to the tetragonal axis respectively. The sharp 91.6 cm-1 line is polarized perpendicular to the tetragonal axis and is assigned to a librational mode of the complex. Induced displacement of the charge-compensating F- ion by X-ray irradiation at low temperature causes a decrease in the intensity of this mode, which tends to support the assignment.

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