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I. Vobornik*, J. Fujii*, M. Mulazzi*, G. Panaccione*, G. Rossi*,§
*TASC National Laboratory, INFM-CNR, S.S. 14, km 163.5, 34012 Trieste, Italy § Dipartimento di Fisica, Universita di Modena e Reggio Emilia, Via Campi 213/A, I-41100 Modena, Italy We measured the electronic structure of the Be(0001) surface using high-resolution angle resolved photoemission (ARPES) with variable polarization synchrotron radiation. We used photons of 32.5 eV and 86 eV delivered by the beamline APE at Elettra, with the two orthogonal linear polarizations. The electronic band structure along the two (GK and GM) high symmetry directions was probed and the Fermi surface cuts were measured. As a function of photon polarization either states of even or odd symmetry with respect to the scattering plane (defined by the direction of light and the propagation direction of the measured outgoing electrons) can contribute to the photoemission intensity. We observe a peculiar change in the symmetry of states when probing different regions of the Brillouin zone with different polarizations. We will discuss the photoemission intensity for Be(0001) by comparing data to the available theoretical results. |