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Evidence of vectorial photoelectric effect on copper

  • Author(s): Pedersoli, E.;
  • Banfi, F.;
  • Ressel, B.;
  • Pagliara, S.;
  • Giannetti, C.;
  • Galimberti, G.;
  • Lidia, S.;
  • Corlett, J.;
  • Ferrini, G.;
  • Parmigiani, F.
  • et al.
Abstract

Quantum Efficiency (QE) measurements of single photon photoemission from a Cu(111) single crystal and a Cu polycrystal photocathodes, irradiated by 150 fs-6.28 eV laser pulses, are reported over a broad range of incidence angle, both in s and p polarizations. The maximum QE (approx. = 4x10-4) for polycrystalline Cu is obtained in p polarization at an angle of incidence theta = 65 deg. We observe a QE enhancement in p polarization which can not be explained in terms of optical absorption, a phenomenon known as vectorial photoelectric effect. Issues concerning surface roughness and symmetry considerations are addressed. An explanation in terms of non local conductivity tensoris proposed.

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