The interplay between the surface band structure and possible surface reconstructions of Mo(112)

The experimental band structure of Mo(112) and the effects by temperature a nd adsorbate are presented. A surface resonance, identified as crossing the Fermi level at about 1/3 from <(Gamma)over bar> to (X) over bar of surface Brillouin zone, was observed to be very sensitive to both contamination an d temperature. We find evidence of adsorbate and temperature induced recons truction of the Mo(112) surface. Examination of low-energy electron diffrac tion (LEED) and scanning tunneling microscopy (STM) data provides evidence for an adsorbate induced reconstruction of the Mo(112) surface with periodi cities consistent with the Fermi level crossing of the surface resonance. T he reconstruction is found to occur at coverages as low as 0.03 Langmuirs o f oxygen or carbon. The reconstruction and/or adsorbate affects the density of states and bands near the Fermi level of al symmetry.