Beryllium Chemical State Plot and Updated BE Values

A recent rapid communication [1] in Surface and Interface Analysis from Chris Mallinson at University of Surrey lays out binding energy and modified Auger parameter values (Table 1) for a number of beryllium compounds.  A chemical state (Wagner[2]) plot (Figure 1) was derived using a combination of XPS BE and AES KE (Figure 2) data.

Table 1. Auger and photoelectron peak energy values for the four beryllium materials.
Figure 1. Wagner chemical state plot for beryllium.

Figure 2. High resolution AES spectra from all forms of beryllium investigated.
Figure 3. Be 1s XPS spectum of Be metal and native oxide [3].
For further spectra see also reference [4].

1. C.F. Mallinson, J.E. Castle, J.F. Watts, Surf. Interface. Anal. 47 (2015) 994.
2. C. D. Wagner, Farad. Discuss. Chem. Soc., 60 (1975)  291.
3. C.F. Mallinson, J.E. Castle, J.F. Watts, Surf. Sci. Spectra 20 (2013) 86.
4. C.F. Mallinson, J.E. Castle, J.F. Watts, Surf. Sci. Spectra 22 (2015) 71.