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Fig. 5


Simplified cartoon illustrating the main pathways taken in our model by the energy that is removed from the XUV field by absorption due to photodissociation and photoionization reactions. In both cases, much of the energy used to cause the photoreaction is released due to exothermic chemical reactions. For photodissociation, the remaining energy from the absorbed photon is given to the thermal energy budget of the neutral gas directly. For photoionization, the remaining energy is released as kinetic energy of the produced electron, and is then lost as the electron collides with the ambient gas; collisions with neutral species are inelastic and lead to excitation, dissociation, and ionization, whereas collisions with ambient thermal electrons are elastic and lead to heating of the electron gas.

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