Copper by XPS
Abstract
High energy resolution spectra of high purity Cu foil that was scraped in situ are presented. The experimental width (16%-84% measurement) of the Fermi level of nickel obtained under identical experimental conditions was 0.32 ± 0.02 eV. The binding energy scale calibration is based on the position of the Au 4f7/2 line which is taken to be 83.98 eV [see M. T. Anthony and M. P. Seah, Surf. Interface Anal. 6, 95 (1984)]. The Auger spectra are presented primarily to provide information on the detailed structure of the line at high energy resolution and accurate measurements of the relative separations between the transitions contained within the line. Since the kinetic energy of a photoelectron depends upon the photon energy and the kinetic energy of an Auger electron does not, the position of the Auger electron on the binding energy scale is a function of the photon energy. For nonmonochromatic x-ray excitation, the positions of the photoelectron lines and Auger lines are fixed relative to one another because the natural x-ray line has a defined centroid. However, for monochromatic Al Kα radiation, the exact photon energy can deviate from the centroid energy by as much as 0.3 eV. Thus, there can be systematic deviations in the binding energies of the Auger lines as recorded with instruments using monochromatic radiation as compared to those using nonmonochromatic x-ray sources. Comparison of the L3M4,5M4,5 line position with other published work [see M. P. Seah, G. C. Smith, and M. T. Anthony, Surf. Interface. Anal. 15, 293 (1990)] suggests that our photon energy is 1486.73 eV, and that all of the Auger line positions recorded in the table are systematically displaced by 0.15 eV.
- Publication:
-
Surface Science Spectra
- Pub Date:
- January 1993
- DOI:
- 10.1116/1.1247725
- Bibcode:
- 1993SurSS...2...55M