Calculates the effective order of non-linearity k for two-photon ionisation of Cs in the region of the minimum in the cross section which occurs at about 2.6 eV photon energy. The authors show that k varies rapidly in this region, and that this variation should be experimentally observable for laser intensities of the order of tens of GW cm -2 .
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Edwards et al. (1980) studied this question.
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