The 3d→4s bands of transition metal ions in LiF and NaF

Abstract
The absorption spectra in the range 5–10 eV for divalent transition metal ions in the host crystals LiF and NaF are presented. Several features of the spectra show that most of the bands observed are well described as 3d→4s transitions. Thus, the effect of reducing the lattice constant of the host crystal is to increase the transition energy; the intensities of the transitions are low and are dependent on temperature or on the presence of a local charge compensator. The variation of transition energy with atomic number follows that of the free ions. Detailed assignments of the bands are discussed.

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