PopRatio

PopRatio is a Fortran 90 code designed to calculate population ratios of atomic levels. The program solves the equations of statistical equilibrium considering all possible bound-bound processes: spontaneous decay, collisional or radiation induced (the later either directly or by fluorescence). The code is very flexible, allowing an arbitrary number of levels or processes to be accounted for. It may find a wide range of applicability in astronomical problems, such as interpreting fine-structure absorption lines or collisionally excited emission lines (such as coronal emission lines) in the spectra of several objects, and also in calculating the cooling rates due to collisional excitation. (Source: http://cpc.cs.qub.ac.uk/summaries/)

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