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Interaction of a moderately intense (I ≈ 10 MW cm −2 ), infrared (λ = 12 µm), short pulse (1 ps) free-electron laser beam with a gold surface is found to cause an intense electron emission (on the order of 1 mA cm −2 ) and a corresponding 'hot' electron spectra (up to a few eV). We show that heating of the electrons through classical acceleration by the laser electric field in the presence of collisions is a possible explanation for such observations.

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