FULL-HEMISPHERE VALENCE-BAND PHOTOEMISSION SPECTRA CALCULATED FOR THEIDEAL SI(001) SURFACE

Angle resolved photoemission spectra from the Si(001) surface have bee n calculated within the highly accurate one-step model. These spin int egrated constant final state spectra for the valence bands have been i nvestigated as a function of the emission direction of electrons. Espe cially, differences between right and left circularly polarized light in the spectra have been considered. A strong circular dichroism is fo und depending on the orbital composition of the contributing initial s tates. From various photoelectron patterns over the full 2 pi hemisphe re an example for a p orbital dominated binding energy is presented an d discussed.