A standard perturbation expansion in the atom-radiation-field interaction is used to calculate the two-photon excitation cross section for the 1s²2s²2p⁴³P to 1s²2s²2p³(⁴S)3p³P transition in atomic oxygen. The lowest-order summation over bound and continuum intermediate states is handled by solving the equivalent inhomogeneous differential equation. Higher-order electron-correlation effects are also examined.
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M. S. Pindzola (1978) studied this question.
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