Electron impact excitation cross section for the 1s_1/2–2p_1/2 transition in H-like Fe. In a) the solid line shows the DARC results with damping included, the dashed line shows the DARC results without radiation damping. The cross sections have been convolved with a 25 eV FWHM Gaussian distribution. In b) the solid line shows the DARC effective collision strengths with radiation damping included, the dashed lines show the DARC results without radiation damping. The solid circles are the DARC results of Aggarwal et al. (2008) and the solid squares are the ICFT results (with radiation damping) calculated as part of this work. The solid diamonds show the damped FAC calculations of Chen et al. (2010).