K-shell x-ray spectroscopy of atomic nitrogen
  Absolute {\it K}-shell photoionization cross sections for atomic nitrogen have been obtained from both experiment and state-of-the-art theoretical techniques. Due to the difficulty of creating a target of neutral atomic nitrogen, no high-resolution {\it K}-edge spectroscopy measurements have been reported for this important atom. Interplay between theory and experiment enabled identification and characterization of the strong $1s$ $\rightarrow$ $np$ resonance features throughout the threshold region. An experimental value of 409.64 $\pm$ 0.02 eV was determined for the {\it K}-shell binding energy. 
M. M. Sant'Anna, A. S. Schlachter, G. \"Ohrwall, W. C. Stolte, D. W.   Lindle and B. M. McLaughlin
astro-ph.EP physics.atom-ph