Surface physics group of Prof. Jürg Osterwalder at the University of Zürich

Photoemission spectra near the He Iα Fermi level of polycrystalline silver. Non-monochromatized (0. Order) and monochromatized (1. Order) He Iα radiation is used. Displaying the data on a logarithmic scale shows that clean radiation (1. Order) resolves thermally excited electrons up to 5 kT above the Fermi level.

Angular resolved and intensity normalized spectra from Ni(111). At room temperature the d-band exchange splitting is clearly resolved, where the minority d-band peaks above the Fermi level. Beyond the Curie temperature no exchange splitting is found.