ANGLE-RESOLVED PHOTOEMISSION-STUDY OF THE CLEAN AND HYDROGEN-COVERED RH(111) SURFACE

We have determined the band structure for the surface-localized states on a clean and hydrogen-covered Rh(111) surface using angle-resolved photoemission. Several of our observed bands are strikingly similar to those observed previously on Pt(111) if the Fermi level is shifted ap propriately given the fewer valence electrons in rhodium. A deviation from this rigid-band behavior is observed for surface bands in the vic inity of the Fermi level near the KBAR point of the surface Brillouin zone. We also compare our results to existing calculations. We find th at these generally provide a good match to our results, although more surface bands are observed than calculated.