Measurements of the absolute photoionization cross section of Fe+ ions from 15.8 to 180 eV

The absolute single- and double-photoionization cross sections of singly charged Fe ions have been measured from 15.8 to. 180 eV using the merged-beam technique. The data yield information about the photoionization continua and the resonance structures resulting from excitation of the outer 3d and 4s electrons as well as the inner 3p, and 3s electrons.. The vast majority of the Fe+ target ions were present in the ground-state configuration, 3d(6)4s, and term, 6 D. The experimental data have been compared with several calculations, for example R-matrix calculations from the Opacity Project and data obtained using the central-field approximations. The experimental data are available at http://www.ifa.au.dk/amo/atomphys/atomphys.htm.