Figure 1
Schematic drawing of the energy levels of Ce and B (a) below room temperature and (b) at 535 K. The energy levels of Ce were estimated using the program HEX (Liberman et al., 1971), those of B were calculated by Mann (1968). The energy difference between 5d and 4f levels is approximately 56 times larger than that between 4f-Γ8 and Γ7 orbitals. |