Handbook on the Physics and Chemistry of Rare Earths. High by S. Hüfner, L. Eyring

By S. Hüfner, L. Eyring

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19a the uncoupled S(Et) can be split into electron-addition and electron-subtraction processes which taust be represented on a common total-energy scale in order to be consistent with the Hamiltonian. It is more usual to represent these two types of excitations on a single particle energy scale where the excitation energy is given as the energy required to modify the population of the considered level with one electron taken or added at Ev. This representation is simply obtained from the previous one by a 180 ° rotation of the electron-addition spectrum.

140 130 120 110 105 100 95 ENERGY LOSS AND BINOING ENER@Y(eV) Fig. 13. Comparison of different 4d spectra of La plotted on a c o m m o n energy scale. The EELS and XPS spectra and the calculated multiplets are taken from Moser et al. (1984), the XAS spectrum from Rabe (1974). The arrows mark the 3d94f 1 final states accessible by dipole-allowed transitions. HIGH-ENERGY SPECTROSCOPY OF LANTHANIDE MATERIALS 31 Figure 13 shows the same types of spectra as those of fig. 12, but now for the 4d threshold excitations in La metal (Moser et al.

After Gerken et al. (1985). 38 Y. -D. S C H N E I D E R B L' I I hv=7OeV sL~ I " ,.? I I 270 K- Tm • --... - ... j / []Z • (b) Tsub = ~. <~: I »' ~ ..... ~'-- ~"" oO ~ o 3 ~~. ° "" z ~ . . --.. bu k • sur[ace 4f 11 L f~2 "~. v k , - , ; ~ , . ;;'" . . . "" 1L (a) Tsub : 13 K . ~ I I I I 12 10 8 6 BINDINGENERGY(eV) Fig. 18. Photoemission spectra of an 1000 Ä thick Tm metal film grown on a copper substrate at two different ternperatures: (a)13 K and (b)270K. The thin solid line through the data points represents the results of a least-squares-fit analysis.

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