ELECTRONIC-STRUCTURE OF (1X1) H/MO(001) - 2-DIMENSIONAL FERMI SURFACES AND NONADIABATIC ADSORBATE VIBRATIONAL DAMPING

The two-dimensional electronic structure of (1 x 1) H/Mo(001) has been measured using photo-emission spectroscopy. A H-induced surface resonance is found that is suitable to participate in the recently observed nonadiabatic electronic damping of H vibrations on this surface. The full two-dimensional Fermi surface of this resonance was measured, and large-scale nesting was observed. This result is used to predict the existence of surface-phonon anomalies.