Figure 4. C(1s) XPS spectra of EMImBF4 obtained using the relative BE values. The data for dot-dashed (1s) and continuous (ΔKS) lines were calculated in this work. The data for the dashed line (Garcia) is taken from Ref 7, dash-dotted line (Tõnisoo) – from Ref 5, dotted line (Schmitz) – from Ref 9. Absolute BE values for the labelled data points are given in Table 2.