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Photoemission from Ag and Al films, mediated by surface plasmons, was studied using a Q-switched Nd:YAG laser (where YAG denotes yttrium aluminum garnet) as a light source in the attenuated-total-reflection configuration. Both the intensity dependence of the photoemission yield and the pulse width of the photoemission signal show for metal one-, two-, and three-photon processes for the laser wavelengths {λ}=355, 532, and 1064 nm, respectively.
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Chen et al. (1993) studied this question.
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