WHITE LINE IN L ABSORPTION-SPECTRA OF RARE-EARTHS IN THEIR OXIDES ANDCUPRATES

A method for curve fitting was used to study and compare the variation in the density of state responsible for the occurrence of the white l ine associated with the L(II) and L(III) absorption discontinuities of rare earths in their oxides and cuprates. It is observed that the inc reased covalent character of the rare earth-oxygen bond in rare earth cuprate results in a decrease in the density of the final energy state responsible for the white line.