In Figure we present XP spectra of different core level regions recorded upon vapor deposition of around 1 ML of BMP-TFSI on a graphite (0001) surface, subsequent deposition of Li, and finally stepwise annealing of the resulting adlayer up to 650 K. The spectra recorded upon BMP-TFSI vapor deposition, which are presented in the bottom of Figure , exhibit characteristic peaks, whose binding energies (BEs) are summarized in Table . Peaks in the C1s core level region refer to the dominant C1s peak of the graphite substrate at 284.6 eV (grey), to carbon atoms with a nitrogen neighbor (CC-N peak at 286.9 eV, light red), which appears as a shoulder at the high BE side of the Cgraphite peak, and to the carbon atoms of the anion with fluorine neighbors (CTFSI at 292.9 eV, cyan). A third peak, which relates to the carbon atoms of the alkyl chain and of the pyrrolidinium ring of the cation with only carbon neighbors (CC-C peak at about 285.6 eV, red) and which is hidden under the graphite substrate peak, is deduced by comparison with spectra recorded on the multilayer film in Figure . A satisfactory fit of the measured spectra was achieved by setting the ratio of the BMP-TFSI related C1s components to 5:4:2, which is the nominal ratio of CC-C/CC-N/CTFSI in BMP-TFSI. In addition, a shake-up satellite of the main Cgraphite peak appears at ∼290.8 eV.