  Data for inelastic processes due to hydrogen atom collisions with iron are
needed for accurate modelling of the iron spectrum in late-type stars.
Excitation and charge transfer in low-energy Fe+H collisions is studied
theoretically using a previously presented method based on an asymptotic
two-electron linear combination of atomic orbitals (LCAO) model of
ionic-covalent interactions in the neutral atom-hydrogen-atom system, together
with the multi-channel Landau-Zener model. An extensive calculation including
166 covalent states and 25 ionic states is presented and rate coefficients are
calculated for temperatures in the range 1000 - 20000 K. The largest rates are
found for charge transfer processes to and from two clusters of states around
6.3 and 6.6 eV excitation, corresponding in both cases to active 4d and 5p
electrons undergoing transfer. Excitation and de-excitation processes among
these two sets of states are also significant.
