Energy calibration of X-ray photoelectron spectrometers. Part III: Location of the zero point on the binding-energy scale
✍ Scribed by Miller, A. C.; Powell, C. J.; Gelius, U.; Anderson, C. R.
- Publisher
- John Wiley and Sons
- Year
- 1998
- Tongue
- English
- Weight
- 233 KB
- Volume
- 26
- Category
- Article
- ISSN
- 0142-2421
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✦ Synopsis
Calibration of the binding energy scale in x-ray photoelectron spectroscopy (XPS) requires location of the zero point. This zero point has previously been identiÐed with the inÑection point in the Fermi-edge region of a valenceband photoemission spectrum of nickel. Comparison of photoemission spectra of nickel and silver measured with monochromated x-rays shows that the inÑection points near the Fermi edge di †er by 45 » 5 meV (where the stated uncertainty indicates the standard uncertainty) at an instrumental energy resolution of 0.30 eV. This di †erence is due to di †erences in the valence-band densities of states (DOS) of the two metals. Simulations of the Ni photoemission spectrum have been performed based on the DOS calculated by Eckhardt and Fritsche, and the simulated spectrum agrees well with the measured spectrum in the near-edge region. Additional simulations of the Ni photoemission spectrum have been carried out with both monochromated Al x-rays and unmonochromated Mg and Al characteristic x-rays to determine how the Ni near-edge inÑection point varies with the energy resolution of the electron energy analyzer in XPS.