Table 1. Strontium 3d5/2 binding energies [1].

Sr 3d5/2 - 3d3/2 doublet separation from [2] is stated as 1.79 eV (for metallic Sr) while an average for the doublet separation from a number of sources/species in [1] is 1.74 eV +/- 0.10 eV (14 citations).

[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:/ 2003.
[2] J.F. Moulder, W.F. Stickle, P.E. Sobol, K.D. Bomben, Handbook of X-ray Photoelectron Spectroscopy, Perkin-Elmer Corp., Eden Prairie, MN, 1992.