Sur la fiabilité du pic 1s du carbone de contamination comme étalon interne d'énergie dans les spectres de photoélectrons |
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Authors: | JP Contour G Mouvier |
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Institution: | Laboratoire de Physico-Chimie Instrumentale, Université Paris VII, 2 Place Jussieu, 75005 Paris France |
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Abstract: | The hydrocarbon contamination of an AEI ES 100 spectrometer has been studied in order to determine the reliability of the C 1s line as a standard in X-ray photoelectron spectra of non conducting solids. With alumina samples, it is shown that the contamination layer of this non ultra-high vacuum spectrometer is a suitable standard of energy for the correction of the charging effect and that it gives relative measurements with an accuracy of ± 0.2 eV when the sample temperature is varied from ?180°C to 200dgC or the sample holder is biased between ?10 and 10 V. About 75 spectra were recorded with powdered alumina compressed into a copper grid and the standard deviations of the corrected kinetic energies of the Al 2p and O 1s photoelectrons are respectively 0.09 and 0.06 eV.No effects of the X-ray tube current and the irradiation time are detected. The charging effect increases with the sample temperature (+0.6 eV from ?180 to 200°C). |
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