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Figure 1
Photoemission spectra of the Pt 4f line taken with 680 eV photons at 10−6 mbar and room temperature on Pt film. (a) Least-squares fit after a Shirley-type background subtraction using four components (see text for details). (b) Evolution of the spectra after a 44 min exposure of the beam at the same spot. The spectra have been shifted with a fixed offset along the intensity axis for clarity. (c) Evolution of the areas of the Pt 4f7/2 peaks as a function of the sequentially acquired spectra: full blue square, red circle, olive triangle and green diamond represent metallic Pt, Pt-Oads/OH, PtO and PtO2, respectively. The grey lines are guides for the eye.

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