  Dissociation of molecular hydrogen by secondary electrons produced by cosmic
ray or X-ray ionization plays a crucial role in the chemistry of the densest
part of molecular clouds. Here we study the effect of the mean kinetic energy
of secondary electrons on this process. We compare predictions using a range of
secondary electron energies and predictions of the cross-sections with the
values in the UMIST database. We find that the predicted column densities
change by nearly one dex.
