Effective H2 formation rate. Left panel: two H2 formation models for a molecular cloud of nH = 104 cm−3 and assuming Td = Tg (MC-ANALYTIC, MC-PHYS and MC-PHYS-CHEM-PAH). We also show the effect of competition diffusion-reaction rates (no compet. MC-PHYS-CHEM-PAH). Right panel: H2 formation model MC-PHYS-CHEM-PAH when Td and Tg can be different.
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