Photoemission from Pt(111)-(hex)-Rb and Pt(111)-(4x1)-RbO using polarised synchrotron radiation

In various experiments it has been demonstrated that the circular dichroism in the angular distribution of photoelectrons (CDAD) is not only observed from oriented initial states (aligned adsorbed molecules or magnetised samp les), but also arises as a consequence of the scattering of photoelectrons from the surrounding atoms in a solid or an adsorbate. In this work we will show first measurements performed at the SGM beamline of the Brazilian Syn chrotron Light Source (LNLS) on a (4 x 1) superstructure of 1 ML RbO adsorb ed on Pt(lll). Measurements from the 4s core levels of Rb adsorbed at Pt(ll l) were also performed at the PM-III beamline at BESSY. The measured variat ions of the intensity and the CDAD with respect to the photon energy are in terpreted in terms of photoelectron diffraction. The results will be used t o discuss the possibility of photoelectron holography using circularly pola rised light. (C) 2001 Elsevier Science B.V. All rights reserved.