SPIN POLARIZATION IN NORMAL PHOTOEMISSION BY LINEARLY POLARIZED-LIGHTFROM NONMAGNETIC (110) SURFACES

For linearly polarized radiation with a non-zero surface projection of the electric-field vector, photoelectrons emitted normal to non-magne tic surfaces with an at most twofold rotation axis generally have a sp in polarization component perpendicular to the surface. This is firstl y substantiated by symmetry arguments. For cubic (110) surfaces, an an alytical calculation reveals that this effect is due to the spin-orbit -induced hybridization of basis functions of different spatial-symmetr y types. Numerical relativistic one-step-model multiple-scattering cal culations for Pt(110) yield polarization values up to 60%, which depen d sensitively on the surface reconstruction.