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 $\pi$-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 ($35<~\hslash \omega <~50$ eV). We present new photoemission measurements for a broad range of photon energies ($8.6<~\hslash \omega <~35$ eV) in which a highly dispersive dangling-bond band is found, in good agreement with the $\pi$-bonded chain model.