  Power exhaust is one of the main challenges for the realization of practical
fusion energy production. The magnetic confinement approach to fusion often
uses a divertor configuration, where power loads are critical. Recent SOLPS
simulations of divertor plasmas in MAST-U and TCV show significant deviations
from the experimental results [36, 35]. A possible explanation for this is the
incorrect incorporation of plasma-molecular interactions in current SOLPS
simulations. SOLPS uses tabulated rate data for the particle physics part of
the simulations [37, 23]. There are, however, large concerns about the accuracy
of these rates, especially for plasma-molecular interactions [33]. Therefore,
in this work, improved rate data from different sources, such as the
Laporta[18] and MCCCDB[29, 27, 28] databases was used, to construct a
Collisional Radiative Model (CRM) to investigate the plasma molecular
interactions in conditions relevant to the MAST-U Super-X divertor. It was
shown that using these rates, a better correspondence with experiment is
achieved than with the tabulated rates. In particular, increased Molecular
Activated Recombination (MAR) and Dissociation (MAD) was observed. Additionally
it was found that molecular processes may be a significant contributor to
divertor physics. The effect of different processes on the vibrational
distribution was also investigated, as well as the radiative emission spectra
generated from the CRM. It was demonstrated that re-evaluation of reaction
rates for plasma-molecular interactions in plasma-edge modelling is necessary.
