THE WHITE LINE IN L-ABSORPTION-SPECTRA OF RARE-EARTH-OXIDES

The method of curve fitting of the experimentally obtained absorption edge has been developed and successfully adopted to study the precise variation in the density of states responsible for the occurrence of t he white line associated with the L(II) and L(III) absorption disconti nuities of rare earth (RE) in their sesquioxides. The theoretical equa tion and the curve fitting routine is flexible enough to include all t he transitions responsible for XANES as well as other phenomena such a s, screening effect, variation in the potential around the metal ion d ue to surrounding ligand ion, charge transfer etc.