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Two‐Photon Transitions and Continuous Emission from Hydrogenic Species

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 1 S and 2 1 S 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.