How to get recombination and collision coefficient?

[Guang Yang]

Hi folks,

I wonder if there's a way to obtain recombination and collision coefficient for a state from cloudy or somewhere else?

Thanks,

Guang

PS: say for MgII, 3p electron state

recombination coefficient: q_rec (units: /s/cm3) = transition_rate_to_3p (by recombination) / ne / n_Mg+

collision coefficient: q_col (units: /s/cm3) = transition_rate_to_3p (by collision) / ne / n_Mg++

[Guang Yang]

Update: I've found the recombination coefficient. But still have no idea about collision coefficient. 

Thanks,

Guang