The DEGAS 2 Monte Carlo neutral transport code
and
its multispecies, Collisional-Radiative, Atomic and Molecular Data code
(CRAMD) have been developed for the purpose of simulating highly
radiative divertors with temperatures 
eV and electron densities 
m-3. The coupled codes are used to calculate the spatial variation
of the Balmer-
emission in a fixed background plasma obtained from a
detached discharge in the Alcator C-Mod device. Vibrationally excited hydrogen
molecules lead to recombination channels which are predicted by CRAMD to be
significant at lower densities and higher temperatures than the familiar
three-body processes. The relative importance of the two processes in the
detached C-Mod divertor is evaluated. Ion-neutral elastic scattering is also
examined.