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K-Shell Photoionization of Singly Ionized Atomic Nitrogen: Experiment and Theory

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arxiv 1203.4256 v1 pith:HIHXC3VQ submitted 2012-03-19 astro-ph.EP physics.atom-ph

M. F. Gharaibeh , J. M. Bizau , D. Cubaynes , S. Guilbaud , N. El Hassan , M. M. Al Shorman , C. Miron , C. Nicolas
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E. Robert C. Blancard B. M. McLaughlin
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classification astro-ph.EPphysics.atom-ph
keywords experimentk-shellnitrogenphotoionizationtheoryabsoluteachievedapprox
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abstract

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/$\Delta$E $\approx$ 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 $\rightarrow$ 2p resonances observed in the spectra.

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