Beamline/Analyser performance

The gas-phase NEXAFS spectra of CH₄, N₂ and O₂ were measured through the TEY signal on the beamline entrance nozzle (right, centre and left figure). The half width of some of the peaks are indicated in the spectra.

Au 4f spectra (left, middle) from a sputtered foil were recorded at different N₂ and H₂ pressures between 10^-5 and 30/40 mbar (photon energy = 900 eV; exit slit = 0.05 mm; pass energy = 20 eV). Au 4f XPS peak intensity (right) as a function of N₂ and H₂ pressure for different photon energies. Symbols: integrated peak area of the measured Au 4f signal; dashed/solid lines: model calculation for photoelectron path length of 0.25 / 0.38 mm.

Au 4f spectra (left) at different photon energies (exit slit = 0.025 mm; pass energy = 5 eV) and combined energy resolution (right) ∆E(squares) and resolving power E/∆E (circles) of beamline and analyser.

Temperature-programmed XPS spectra during heating of a Pd foil in 1 mbar O2. Pd 3d - 2D plot BE vs temperature and Pd 3d spectra at selected temperatures (above). O 1s / Pd 3d3/2 2D plot BE vs temperature and O 1s / Pd 3p3/2 spectra at selected temperatures (below). Photon energy = 750 eV; exit slit = 0.05 mm; pass energy = 10 eV. Time per single spectrum about 40 s.

Mo L2,3-edges NEXAFS spectra (left) of molybdenum foil (grating: 1200 l mm-1, exit slit: 0.012 mm) and C K-edge NEXAFS spectra (right) of highly oriented pyrolitic graphite (HOPG) (grating: 600 l mm-1, exit slit: 0.100 mm).