Photoemission from clean Al(110): experiment and ab-initio theory

The angle-resolved energy distributions of photoelectrons from clean Al(110) have been measured for photon energies in the range 10-60 eV. Previously unknown structures in the spectra are identified as being due to emission from a surface state band and several surface resonance bands. The experimental results are interpreted by means of ab-initio calculations of the surface electronic structure based on density functional theory, in which the experimentally-observed oscillatory surface relaxation is taken into account. The calculated surface electronic structure is found to be in good overall agreement with the experimental data. The calculation is also used to investigate the effects of oscillatory surface relaxation on the surface electronic structure.