Multiphoton ionization in atomic gases with depletion of neutral atoms

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Abstract
An expression for the number of ions formed by multiphoton ionization of atoms at the focus of a Q-switched laser beam is derived assuming a rate given by existing perturbation treatments. Depletion of neutral atoms has the effect of indicating a lower than expected value for the number of photons absorbed. It is concluded that discrepancies between existing experimental data and perturbation results could be accounted for by such depletion.

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