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Table 1
Thermal and non-thermal processes and chemical reaction types included in the chemical model for both the type IIb SN ejecta and the post-RS gas.
| Reaction description | Gas regime/location | ||||
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| Thermal | |||||
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| Unimolecular | AB | −→ | A + B | Thermal decomposition | Very high temperature |
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| Bimolecular | AB+ C | −→ | BC + A | Neutral exchange | High temperature |
| A + B | −→ | AB + hν | Radiative association | T independent | |
| AB + M | −→ | A + B + M | Collision dissociation | High density | |
| AB+ + C | −→ | BC+ + A | Ion−Molecule | T independent | |
| AB+ + C | −→ | AB + C+ | Charge exchange | T independent | |
| A + + e− | −→ | A + hν | Radiative recombination | T independent | |
| AB + + e− | −→ | A + B | Dissociative recombination | T independent | |
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| Termolecular | A + B + M | −→ | AB + M | Three-body association | High density |
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| Non-Thermal | |||||
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| A + CE | −→ | A+ + e− +CE | Ionisation by Compton e− | entire SN ejecta | |
| AB + CE | −→ | A + B + CE | Dissociation by Compton e− | entire SN ejecta | |
| AB + hν | −→ | A + B | Photo-dissociation | post-RS gas | |
| A + hν | −→ | A+ + e− | Photo-ionisation | post-RS gas | |
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