Confirmation of a Highly Dispersive Dangling-Bond Band on Ge(111)-2 × 1

In contrast to our earlier measurements as well as the band calculated from the π-bonded chain model, a very narrow dangling-bond band has been reported by Solal et al. from a recent photoemission experiment on the Ge(111)-2 ×{} 1 surface (35<~ω<~50 eV). We present new photoemission measurements for a broad range of photon energies (8.6<~ω<~35 eV) in which a highly dispersive dangling-bond band is found, in good agreement with the π-bonded chain model.