Abstract

Polycrystalline metallic photocathodes with a covering native oxide layer were exposed to several wavelengths (213, 266 and 355 nm) of a picosecond Nd 3+-YAG laser. Laser illumination at each wavelength was used to induce oxide film removal and a measurable photoelectric response simultaneously. The change of the photoelectric signal was monitored throughout the irradiation process. The evolution of the photoelectric signal was investigated as a function of the applied wavelength and interpreted in terms of possible surface structural changes.

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