Abstract

Multiphoton ionization of Mg was studied with an excimer laser (XeCl, λ = 308 nm). The laser-intensity dependence of the number of ions indicates that the lowest-order two-photon process, which has enough energy to reach the first ionization limit, fails to dominate the ionization of Mg. The slope is 3 when a low-enough extracting field is applied and increases with the latter. A three-photon resonance with some autoionizing states is proposed as a partial explanation of this abnormal phenomenon, but the variation of the slope of the log N versus log I curve as a function of a dc electric field remains unexplained.

© 1987 Optical Society of America

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