A study of the white lines associated with the rare earth L<SUB>II</SUB> and L<SUB>III</SUB> absorption discontinuities in some oxides and tungstates

The intensities are studied of the white lines associated with the LII and LIII absorption discontinuities of the rare earth elements in their oxides RE2O3 (RE = La, Ce, Pr, Nd, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu) and some tungstates RE2(WO4)3 (RE = La, Ce, Nd, Sm, Gd and Dy). These white lines correspond to the absorption transitions from the 2p½ to the 5d3/2 and from the 2p3/2 to the 5d5/2 levels. It is observed that the intensities of the white lines depend upon the filling of the 4f levels, which partially overlap the 5d levels