High resolution X-ray photoelectron spectroscopy on nitrogen molecules K. Ueda, R. Püttner, N. A. Cherepkov, F. Gel'mukhanov and M. Ehara Eur. Phys. J. Special Topics, 169 (2009) 95-107 Published online: 17 March 2009 DOI: 10.1140/epjst/e2009-00978-7