Spin-dependent photoemission intensities from platinum (111)

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Abstract
Photoemission spectra have been obtained from a Pt(111) surface using nearly circularly polarized light with positive and negative helicity from the Berlin storage ring BESSY. Strong intensity asymmetries, i.e., normalized intensity differences for both helicities, with absolute values of more than 45% have been found, indicating an almost complete spin selection during the transmission of the excited electrons into the vacuum. Clearly antisymmetric behavior of the asymmetry with respect to a crystal mirror plane has been observed in accordance with theoretical expectations.