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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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