Implement grain-charge reactions #98
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The reaction rate for electron attachement and ion recombination on charged grains now include a Coulombian factor. Since this factor depends on the grain charge and the collider (electron/ion), seperate reaction types are implemented for each of these: - Type 24: e(-) + grain - Type 25: e(-) + grain(+) - Type 26: ion + grain(-) - Type 27: ion + grain The rate are computed following Dimitry Semenov's recommandations.
The sticking coefficient for electrons on grains should decrease exponentially with the dust temperature.
The sticking coefficient S for electrons on the grains is already taken into account in the rate computation, so we don't need an additional parameter in the network file.
The original reference for the electron attachment and ion recombination on grains has been added.
Same sticking probability as in Kunz & Mouschovias (2009).
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