Site-Specific Valence Photoemission Spectroscopy of Hematite
Abstract
The crystallographic site-specific valence band (VB) electronic structure of alpha-Fe2O3 was studied by x-ray standing wave (XSW) induced photoemission. By fine tuning the incident photon energy with respect to the 0.5 eV wide (10-14) Bragg reflectivity peak in the back reflection geometry, we were able to controllably position the XSW antinodes with respect to the (10-14) diffraction planes. By choosing two photon energies that gave the maximum contrast for the Fe and O photoemission signals, we were able to separate out the Fe and O photoemission spectra. In the VB region of the spectra, the O component has two peaks with binding energies at 4.0 and 7.2 eV. The Fe component consists of four peaks extending 18 eV below the Fermi level with maxima at 2.7, 5.3, 8.0, and 12.4 eV. Our results show good agreement with a theoretical calculation for the Fe 3d derived final states which includes d4 and d5L photoemission final states [1]. This work was supported by the EMSI program of NSF and DOE (CHE-9810378). [1] A. Fujimory et al, Phys. Rev. B 34, 1318 (1986).
- Publication:
-
APS March Meeting Abstracts
- Pub Date:
- March 2002
- Bibcode:
- 2002APS..MAR.S8003B