Peak widths binding energy

Fig. 4 Effect of gold concentration on the binding energy difference Ej[C(ls)]-EB[Au(5f7/2)] (0), and on the full width in the half maximum (FWHM) (A) of Au (5f7/2) peaks in XPS spectra.

We summarize here the features of the UPS and UVA data which lead to the molecular ion concept for these aromatic pendant group polymers. First, the spectra of the polymers PVP and PS are essentially identical to those of condensed model molecular moieties 2-vinyl pyridine and ethyl benzene, respectively. Second, the solid-state spectra are related to the gas-phase spectra of these model moieties by an essentially constant shift to higher energy (lower binding energy) of all the ionization peaks by = 1.5 0.1 eV. Third, the width in energy of the solid-state ionization peak is Air = 1.0 0.1 for both polymers... 

XPS enables the determination of the oxidation state of the Mn ions. The most precise evaluation rests on the measurement of the binding energy difference between the Mn 3s main peak and its shake-up satellite [2-4].The XPS analysis of the samples was performed on a SSI X-probe (SSX 100/206) spectrometer of FISONS equipped with a monochromatised microfocused A1 X-ray source (1486.6 eV). The angle between the sample surface and the electron detection axis was 55°. The analyser pass energy was set at 50 eV and the analyzed area was 1.4 mm. At these conditions, the energy resolution determined by the Au 4fj/2 full width at half maximum (FWHM) of gold was 1.1 eV. The XPS results are reported in Table 1. 

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