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The intensity distribution in the focal region of a laser beam is calculated for a Gaussian profile truncated by a circular aperture. The results give the theoretical ionization volume as a function of the laser intensity and this allows calculation of the multiple ionization of atoms by an intense laser. As an example, the yields of multiply charged ions of xenon are calculated for focused intensities in the range 10 13 to 10 16 W cm -2 . Oscillations in the yield curves are produced, with an implication that this behaviour may explain some experimental observations.
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Zhang et al. (1994) studied this question.
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