Photoionization processes are considered for situations in which the laser frequency is close to a resonant frequency of the final positive ion core. It is predicted that resonant coupling within the ionic core can split photoelectron spectral peaks into doublets, with components separated by the effective Rabi frequency of the core. The possibility of superposing this final-state effect with previously studied effects involving laser-induced autoionizing states is considered. Specific predictions are made for the splitting of photoelectron peaks in photoionization of strontium.
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Grobe et al. (1994) studied this question.