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Cosmic ray dissociation of molecular hydrogen and dense cloud chemistry
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Dissociation of molecular hydrogen by secondary electrons produced by cosmic ray or X-ray ionization plays a crucial role in the chemistry of the densest part of molecular clouds. Here we study the effect of the mean kinetic energy of secondary electrons on this process. We compare predictions using a range of secondary electron energies and predictions of the cross-sections with the values in the UMIST database. We find that the predicted column densities change by nearly one dex.
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Resolving dense photo-dissociation regions: the structure of photochemical fronts in three-dimensional gas distributions
A three-dimensional PDR model shows that overlapping H2 dissociation and C+ recombination fronts, plus the arc-like H2 emission seen in the Orion Bar, arise from shadowing by dense clumps in a fractal gas distribution.
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