Two-photon absorption cross sections are calculated for the hydrogen atom and the hydrogen molecule. Three methods of calculation are employed: (1) a second-order time-dependent perturbation expansion; (2) a ``mean-energy'' approximation; (3) a sum-rule equivalent of perturbation theory. The various methods are compared and evaluated in terms of their general utility in describing double-photon absorption processes.
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Honig et al. (1967) studied this question.
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