Multiphoton ionization via four-photon excitation of high-lying Rydberg states in xenon and krypton has been studied. The p and f series leading to the ²P3/2 ionization limits as well as the p' and f' autoionizing levels leading to the ²P1/2 limits have been recorded for both gases. Lower members of the p series in xenon are resolved into p[(5/2)]₂, p[(3/2)]₂, and p[(1/2)]₀ sublevels. Ionization potentials and quantum defects are obtained by a least-squares fitting of the data to the standard Rydberg formula.
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Blazewicz et al. (1987) studied this question.
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