d–d Spectra of titanium(II) and vanadium(II) ions doped into a sodium chloride host lattice

Abstract

The preparation of sodium chloride crystals doped with titanium(II) and vanadium(II) ions is described and the homogeneity of the samples considered. Temperature-dependent electronic spectra of the ligand-field bands are reported and the results fitted to a coth (θ/2T) expression. At low temperature, vibronic progressions of 9–11 units are observed on some bands. The information which may be obtained from the spectra regarding the geometry of the site and the nature of the vibronic coupling is discussed.