Divertor detachment requires plasma-neutral interactions which dissipate momentum, power and particles simultaneously. Plasma-molecular interactions can result in molecular ions which react with the plasma. This can contribute to detachment through molecular activated recombination (MAR) and molecular activated dissociation (MAD), both of which create excited atoms, removing the energy as photons when they decay. In the case of MAR there is also a net ion sink which directly reduces the ion flux. Hydrogen emission from these processes have been detected experimentally in detached TCV, JET and MAST-U deuterium plasmas. These TCV findings, however, were in disagreement with SOLPS-ITER simulations for deuterium, which indicated that the molecular ion density was insufficient to lead to significant hydrogen emission.