Zeeman infrared spectra of calcium and strontium fluoride crystals containing cerium and neodymium

Electron paramagnetic resonance enhanced crystal field analysis for low point-group symmetry systems: C2v sites in Sm3+:CaF2/SrF2

We present a comprehensive spectroscopic study of C[Formula: see text] point-group symmetry sites in Sm[Formula: see text]:CaF[Formula: see text]/SrF[Formula: see text] codoped with either NaF or LiF. Data includes electron paramagnetic resonance measurements of Zeeman and hyperfine interactions for the ground state, as well as site-selective excitation and fluorescence spectroscopy up to the [Formula: see text]G[Formula: see text] multiplet. Inclusion of the EPR data allowed us to determine unique crystal-field parameters. The parameters provide information about the geometry of the sites and the nature of the interactions between the Sm[Formula: see text] dopant and the alkaline earth co-dopant.

Theoretical studies of the g factors and local structure for the tetragonal Nd3+ center in SrTiO3

The anisotropic g factors g(//) and g(perpendicular) and the local structure for the tetragonal Nd(3+) center in SrTiO(3) are theoretically studied using the perturbation formulas of the g factors for a 4f(3) ion in tetragonal symmetry. This center is attributed to the impurity Nd(3+) occupying the dodecahedral Sr(2+) site in SrTiO(3), associated with one nearest neighbour interstitial oxygen O(I) along [001] (or C(4)) axis. The impurity Nd(3+) is found to suffer the large displacement (approximately 1.1A) towards the O(I) along the C(4) axis due to their strong interaction. The calculated g factors based on the above impurity axial displacement show reasonable agreement with the experimental results.