Charge-transfer satellites

Fig. 9.10. XPE spectra of LaFeOj in the La(3d) region showing the charge-transfer satellites at an energy separation of approximately 4 eV from 3d5/2 and 3d3/2 signals. The weaker satellites at an energy separation of 13-16 eV are attributed to energy loss processes [50].

Fig. 9.11. XPE spectra of CeF3 in the Ce(3d) region showing the existence of charge transfer satellites along...

Fig. 9.13. XPE spectra of 3d3/2 region of Nd203 showing the existence of shake-down charge transfer satellite peak on the lower binding energy side of the main peak [50].

Nakagaki, R. Frost, D.C. and McDowell, C.A. (1980) The Intermolecular Charge-Transfer Interaction in X-ray Photoelectron Spectoscopy The Charge Transfer Satellites Observed in p-Nitroaniline and Related (Compounds, J. Electron Spectroscopy and Related Phenomena, 19, 355-370... 

After publication of the X-ray study, the charge transfer was obtained from the reciprocal-space position of the satellite reflections, which occur in the diffraction pattern at temperatures below the Peierls-type metal-insulator transition at 53 K (Pouget et al. 1976). Assuming that the gap in the band structure occurs at twice the Fermi wavevector, that is, at 2kF, the position of the satellite reflections corresponds to a charge transfer of 0.59 e, in excellent agreement with the direct integration. The agreement confirms the assumption that the gap in the band structure occurs at 2kF. 

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