The influence of the surface on the photoassisted field emission from a metal is studied theoretically for two simple models of the solid. First, we consider the model of a half-space square well for the metal, and solve exactly for the current density after ignoring the Schottky effect. Next, we take into account the effect of the image charge, and calculate the current density in the WKB approximation. Numerical results based on the calculations are compared with the recent experimental data on photoassisted field emission from tungsten. Areas of agreement and discrepancy between the theory and experiment are pointed out and discussed.
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Amitabha Bagchi (1974) studied this question.
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