The intensities are studied of the white lines associated with the L,, and LllI absorption discontinuities of the rare earth elements in their oxides RE,O, (RE = La, Ce, Pr, Nd, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu) and some tungstates RE,(WO,), (RE = La, Ce, Nd, Sm, Gd and Dy). These white lines correspond to the absorption transitions from the 2p1,, to the 5d,,, and from the 2p,,, to the 5d,/, 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.
Une etude des intensites des raies blanches associees avec les discontinuZtCs d' absorption L,, an Llrl des elements des terres rares dans leurs oxide RE,O, (RE