The authors report experimental data on 'above-threshold' multiphoton ionisation of Xe via a three-photon resonance. The ratio of the five-photon ionisation probability to that for (5+1)-photon ionisation is interpreted in terms of the measured angular distributions for both processes and the 'energy conserving' continuum-continuum matrix elements. A calculation of these matrix elements on the basis of a model potential leads to a ratio of the (5+1)-photon signal over the five-photon signal in good agreement with the experimental value of about 3*10 -3 at an intensity of 10 11 W cm -2 .
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Kruit et al. (1983) studied this question.
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