Ytterbium Clusters in Fluorite CaF2.

Authors :: Nikiforov, Anatoliy E.
Chernyshev, Vladimir A.
Volodin, Vasiliy P.
Avram, Nicolae M.
Avram, Calin N.
Source :: AIP Conference Proceedings; 5/17/2009, Vol. 1131 Issue 1, p96-101, 6p, 2 Diagrams, 4 Charts
Publication Year :: 2009
Abstract: The crystal structure of the ytterbium hexameric cluster in CaF<subscript>2</subscript> has been calculated in the framework of the embedded—cluster method within the shell model, in pair potential approximation. The crystal field parameters and scheme of the energy levels for Yb<subscript>6</subscript>F<subscript>36</subscript> hexameric cluster were calculated in the exchange charges model. Also, the optical spectra of Yb<superscript>3+</superscript> single center in CaF<subscript>2</subscript> (cubic and tetragonal symmetry) was calculated and discussed. [ABSTRACT FROM AUTHOR]