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A previously presented narrow-bandwidth theory is used to interpret recent data on the four-photon ionization of Cs near the $6F$ resonance. The theory is based on treating the amplitude of the radiation field as a constant relative to its rapid phase oscillations. The ionization rate adiabatically follows a pulsed amplitude leading to maximum ionization for times at which the pulse develops sufficient intensity to shift the 6S→6F transition into resonance.
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Burke Ritchie (1979) studied this question.
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