We discuss the implementation of two-photon emission and absorption in Cloudy, a general-purpose photoionization and radiative transfer code. We now include induced two-photon absorption between the 1s and 2s levels of hydrogen and hydrogen-like ions and between the 1 1S and 2 1S levels of the He-like isoelectronic sequence. We show sample calculations predicting the full emitted continuum and have implemented a method to allow this continuum to be saved in FITS format and reused in other applications. 1.
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Bottorff et al. (2006) studied this question.
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