Absorption Spectra of the Samarium Ion in Solids. V. The Absorption Spectrum and Energy Levels of the Sm+++ Ion as It Exists in Monoclinic Crystals of Sm2(SO4)3 · 8H2O

Abstract

The absorption spectrum and energy levels indicated therein for the samarium ion in crystalline monoclinic ${\mathrm{Sm}}_2$ ${\left(\mathrm{S}{\mathrm{O}}_4\right)}_3$·8${\mathrm{H}}_2$O are shown to be similar to those of Sm${\mathrm{Cl}}_3$·6${\mathrm{H}}_2$O, which is also a monoclinic salt. Absorption lines of the sulfate at temperatures between 20°K and room temperature are used to prove the existence of several low-lying levels separated from the basic one by 160, 188 and 225 ${\mathrm{cm}}^{-1\mathrm{}}$. These levels are of particular interest in view of heat capacity and magnetic studies of this salt.