M F Gharaibeh (1), J M Bizau (2,3), D Cubaynes (2,3), S Guilbaud (2), N El Hassan (2), M M Al Shorman (2), C Miron (3), C Nicolas (3), E Robert (3), C Blancard (4) and B M McLaughlin (5,6)
((1) Department of Physics, Jordan University of Science and Technology, Irbid, Jordan; (2) Institut des Sciences Moléculaires d’Orsay, Université Paris-Sud, Orsay cedex, France; (3) Synchrotron SOLEIL – L’Orme des Merisiers, Saint-Aubin, Gif-sur-Yvette cedex, France; (4) CEA-DAM-DIF, Bruyères-le-Châtel, Arpajon Cedex, France; (5) Centre for Theoretical Atomic, Molecular and Optical Physics (CTAMOP), School of Mathematics and Physics, Queen’s University Belfast, Belfast, Northern Ireland, UK; (6) Institute for Theoretical Atomic and Molecular Physics (ITAMP), Harvard Smithsonian Center for Astrophysics, Cambridge, MA, USA)
Absolute cross sections for the K-shell photoionization of C-like nitrogen ions were measured by employing the ion-photon merged-beam technique at the SOLEIL synchrotron radiation facility in Saint-Aubin, France. High-resolution spectroscopy with E/ΔE ≈ 7,000 was achieved with the photon energy from 388 to 430 eV scanned with a band pass of 300 meV, and the 399.4 to 402 eV range with 60 meV.
Experimental results are compared with theoretical predictions made from the multi-configuration Dirac-Fock (MCDF) and R-matrix methods. The interplay between experiment and theory enabled the identification and characterization of the strong 1s → 2p resonances observed in the spectra.
Complete preprint ==> http://arxiv.org/abs/1203.4256