Abstract
In normal photoemission from (1 1 1) surfaces of non-magnetic centro- symmetric cubic crystals by off-normally incident linearly and unpolarized light, spin-orbit coupling produces two different spin polarization effects. One, which already occurs for normal incidence, arises from half-space initial states of double group symmetry Λ 4+5. The other comes from Λ 6 states and reflects the hybridization of basis functions of spatial symmetries Λ 1 and Λ 3. For a special azimuthal angle of photon incidence the two surface-parallel spin polarization vectors are perpendicular to each other. Relativistic dynamical calculations for Pt(1 1 1) reveal large polarization features, which are sensitive to the surface barrier.
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