In routine EELS measurements, the major La (lanthanum) EELS edges used are M₅ 832 eV and M₄ 849 eV, and N_4,5 99 eV as shown in Figure 1477a.

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Figure 1477a. Major La (lanthanum) EELS edges used in routine EELS measurements: (a) M5 832 eV and M4 849 eV (most often used) and (b) N4,5 99 eV.

Other weaker edges of La are M₃ 1123 eV and M₂ 1204 eV, N₁ 270 eV and N_2,3 191 eV as shown in Figure 1477b. Since those edges are very weak, they are not used usually.

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Figure 1477b. Other weaker edges of La: (a) M3 1123 and M2 1204, (b) N1 270 eV, and (c) N2,3 191 eV.