Beam-foil spectroscopy of chlorine and sulfur ions

We report on the measurement of spectra of highly stripped chlorine and sulfur ions in the energy ranges of, respectively, 2900 - 3500 eV and 2300 - 2600 eV. The spectra have been obtained after excitation of ions travelling through a thin carbon foil. X-rays emitted by the emerging beam are analysed with a Johann-type bent crystal spectrometer. The observation angle with respect to the beam axis is 540. The interpretation of the spectra is performed by comparing experimental results with Multiconfiguration Dirac-Fock (MCDF) calculated energies and intensities. All the lines are interpreted by 2p - ls transitions (Kα spectrum) in excited ions with, respectively, H-, He-, Li-, Be- and B-like electron structures