Absolute Photoionization Cross Section for Fe 6+ to Fe 10+ Ions in the Photon Energy Region of the 2p–3d Resonance Lines
Résumé
Abstract Resonant single photoionization cross sections of Fe n+ ( n = 6 to 10) ions have been measured in absolute values using a merged-beams setup at the SOLEIL synchrotron radiation facility. Photon energies were between about 710 and 780 eV, covering the range of the 2p–3d transitions. The experimental cross sections are compared to calculations we performed using a multi-configuration Dirac–Fock code and the OPAS code dedicated to radiative opacity calculations. Comparisons are also done with the Chandra X-ray observatory NGC 3783 spectra and with the results of previously published calculations.