Lowest order thermal correction to the hydrogen recombination cross
  section in presence of blackbody radiation
  In the present paper, the correction due to the thermal interaction of two
charges to the recombination and ionization processes for the hydrogen atom is
considered. The evaluation is based on a rigorous quantum electrodynamic (QED)
approach within the framework of perturbation theory. The lowest-order
radiative correction to the recombination/ionization cross-section is examined
for a wide range of temperatures corresponding to laboratory and astrophysical
conditions. The found thermal contribution is discussed both for specific
states and for the total recombination and ionization coefficients.
