А. А. Khokhryakov, А. О. Vershinin, А. S. Payvin, А. А. Lizin
hyperresponsive transition, intensity, nonfeloxetic effect, bond covalence, neodymium fluoride.
Electron spectra of Nd(III) ions in molten fluorides of alkali metals were obtained using electron spectroscopy of absorption and reflection. f-f electron transition of the Nd(III) ion in molten alkali fluorides has as high-frequency as low-frequency shifts. The intensity of the hyperresponsive absorption bands (4I9/2→4G7/2, 4G9/2 и 4I9/2→4G5/2, 2G7/2) was found to depend on the symmetry of the NdF63- complex groups. Nonfeloxetic shift is typical for hyperresponsive transitions. High-frequency shift of the Nd (III) hyperresponsive absorption band at changing molten NaF on KF is explained by the composition alteration of the second coordinative sphere in the NdF63- complex group.