4f14to 4f135d optical transitions of divalent ytterbium in the potassium and sodium halides

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Abstract
The optical absorption spectra of Yb2+ in a range of potassium and sodium halide crystals are described and analysed. Attention is focused on the strongly allowed 4f14 to 4f135d transitions. Excellent general agreement is obtained between theory and experiment provided that a correction based on the nephelauxetic effect is included. Parallel linear dependencies for the potassium and sodium halides are established between a parameter Delta , representing the energy difference between the centre of energy of the excited 4f135d configuration and the 4f14 ground state, and the lattice parameter d. Similar dependencies are established between the crystal-field parameter Dq and d.