Evidence of vectorial photoelectric effect on Copper
نویسندگان
چکیده
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 (≃ 4×10−4) for polycrystalline Cu is obtained in p polarization at an angle of incidence θ = 65◦. 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 tensor is proposed. PACS numbers: 79.60.Bm, 61.80.Ba, 41.85.Ar
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