Nicoara, I.; Paraschiva, M.; Stef, M.; Stef, F. - In: The European Physical Journal B - Condensed Matter and … 85 (2012) 8, pp. 1-7
CaF<Subscript>2</Subscript> crystals doped with various concentrations of PbF<Subscript>2</Subscript> (0.4, 0.5, 1 and 2 mol%) were grown in vacuum, in a shaped graphite furnace using the vertical Bridgman method. The optical absorption spectra reveal the four characteristic UV absorption bands (labeled A, B, C and D) of the Pb<Superscript>2+</Superscript> ions. As...</superscript></subscript></subscript>