Abstract
The dispersion of'' occupied and unoccupied electronic states normal to the surface of clean Ge(OO1) 2x1 surfaces is investigated by angleresolved vacuum UV photoemission using synchrotron radiation. Spectra are taken not only at constant photon energy in the energy distribution curve (EDC) mode but also in modes where the photon energy is scanned to obtain spectra at constant initial state energy (CIS) or constant final state energy (CFS). The results are compared with different bulk band structure calculations by means of electron transition plots (ETplots) where final state energies of observed peaks are displayed as a function of the corresponding initial state energies.
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