Table 1. Nitrogen 1s binding energy values [1].
a) The binding energy values for nitrogen in organic compounds overlap significantly and can be difficult to decipher especially if there are multiple nitrogen containing groups. An excellent resource is Appendix 4 in the "High Resolution XPS of Organic Polymers - The Scienta ESCA300 Database"[2].
References:
[1] C.D. Wagner, A.V. Naumkin, A. Kraut-Vass, J.W. Allison, C.J. Powell, J.R.Jr. Rumble, NIST Standard Reference Database 20, Version 3.4 (web version) (http:/srdata.nist.gov/xps/) 2003.
[2] G. Beamson, D. Briggs, High Resolution XPS of Organic Polymers - The Scienta ESCA300 Database Wiley Interscience, 1992.