Abstract
The photoinduced electron emission from the surface of a solid gold target irradiated by single picosecond pulses of an erbium laser is investigated. The applied laser intensity (5–120 GW/cm2) corresponds to the intermediate interaction region between the pure multiphoton and tunnel effects, where the decisive Keldysh-parameter, γ, is in the range 1<γ<12=n 0. In the light intensity region which is free of surface heating (I L<80 GW/cm2), the slope of the measured logarithmic intensity dependence of the photocurrent decreases from the n 0=12 perturbative value down to n ℞ 5. Therefore the experiment shows that the Keldysh-type theories, which have recently been proved to describe correctly the ionization of atoms, are also valid to a certain extent in the case of the photoeffect in metals.
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Tóth, C., Farkas, G. & Vodopyanov, K.L. Laser-induced electron emission from an Au surface irradiated by single picosecond pulses at λ=2.94 μm. The intermediate region between multiphoton and tunneling effects. Appl. Phys. B 53, 221–225 (1991). https://doi.org/10.1007/BF00357140
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DOI: https://doi.org/10.1007/BF00357140