that used for Ni as described in reference .
Table 1. Co 2p3/2 spectral fitting parameters: binding energy (eV), percentage of total area, FWHM value (eV) for each pass energy, and spectral component separation (eV).
Obtaining a pure CoO specimen for analysis is problematic. Initial analysis of a commercial CoO sample showed the surface to be extensively oxidized to Co3O4 even though the bulk powder XRD spectrum showed only CoO. This appears to be a common problem with two published databases [4,5] showing similar Co3O4 oxidized surfaces for CoO. Note: Be forewarned that this has caused some confusion in the literature.
 M.C. Biesinger, B.P. Payne, A.P. Grosvenor, L.W.M. Lau, A.R. Gerson, R.St.C. Smart, Appl. Surf. Sci. 257 (2011) 2717.
 J. Yang, H. Liu, W.N. Martens, R.L. Frost, J. Phys. Chem C 114 (2010) 111.
 M.C. Biesinger, B.P. Payne, L.W.M. Lau, A.R. Gerson, R.St.C. Smart, Surf. Interface Anal. 41 (2009) 324.
 B.V. Crist “Handbook of Monochromatic XPS Spectra, Vol. 2 Commercially Pure Binary Oxides” XPS International Inc. (1999) pg 72-78.