Inhomogeneous charge effect on a natural mineral studied by XPS
1994
We report on XPS results that show an inhomogeneous charge effect, greater than 1.0 eV and far greater than the accuracy of the measurements (∼0.2 eV), exhibited by a natural mineral essentially composed of SiO2 and Fe2O3. This mineral has proved to be an efficient catalyst in a Fischer–Tropsch reaction. We have corrected this differential charge effect by using two internal references in order to interpret satisfactorily our XPS data.
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