Interplay between plasmons and the band structure for the Mo(112) surface - art. no. 115408

Recent photoemission and inverse photoemission results for the Mo(112) surf ace are discussed in the framework of the calculated band structure. For th e Mo(112) surface, the main photoemission features combine contributions fr om both the surface and the bulk. Except for those photon energies near to excitations of the bulk and multipole surface plasmons, the comparison of t he bulk band structure, along the k points normal to the surface, shows a g ood agreement with photoemission spectra in the position of the critical po ints. The dominant surface states at <(<Gamma>)over bar> are found to have the a(1) symmetry, while the band along <(<Gamma>)over bar>-(Y) over bar at about 0.8 eV binding energy is found to be odd with respect to the <(<Gamm a>)over bar>-(X) over bar mirror plane. The surface-induced enhancement of photoemission-the surface photoeffect-is indicated and is shown to be respo nsible for dramatic changes in the spectra when the photon energy falls int o the region of the multipole surface plasmons.