Subsequent vapor deposition of about 0.7 monolayers (MLs) of Li on the BMP-TFSI covered surface at RT results in significant changes in the different regions, which are illustrated in the next higher spectra in Figure . For the F1s peak, we find an up-shift of the dominant peak to 690.2 eV, together with a severe loss in intensity. The dominant peak is attributed to a BMP-TFSI peak that due its interaction with adsorbed Li is up-shifted in BE by about 1.4 eV (FTFSI,Li, cyan). Reasons for this Li induced shift will be discussed further in section 3.2.2. Similar Li induced up-shifts by about 1.3 -1.7 eV are also observed for the TFSI-related N1s, O1s, S2p and C1s peaks, and for the BMP-related N1s and C1s peaks. For the N1s peaks, the up-shift is most pronounced (1.7 eV), both for the TFSI-related and the BMP-related peak (the N1s spectra after Li deposition of 0.2, 0.3 and 0.5 ML, which are presented as well, reveal similar up-shifts). Also the main graphite peak at 284.6 eV reveals a small up-shift in BE by about 0.2-0.3 eV (Cgraphite+Li, indicated by the dashed lines) upon Li post-deposition, which back-shifts upon heating to > 500 K. This was assigned earlier to a rigid band shift due to charge transfer from Li to the top graphite layers, and will be discussed later in section 3.2.1. At the same time, small peaks appear at 686.2, 530.1, 398.8 and 161.0 eV (filled yellow), which will be denoted as Fdec-1, Odec-2, Ndec-2 and Sdec-2. These peaks had been assigned previously to inorganic products of Li-induced decomposition reactions such as LiF-, Li3N-or Li2S-or Li2Olike species. This will be discussed in more detail later (section 3.2.2). For the O1s and S2p peaks, deconvolution reveals the formation of additional peaks at 532.6 eV (Odec-1, blueyellow) and 169.0 eV (Sdec-1, blue-yellow), respectively, which are most likely related to one or more molecular fragments resulting from the interaction with Li. Also these assignments will be discussed in more detail in section 3.2. Interestingly, the total intensity of the F1s peaks decreases significantly upon Li deposition, by slightly more than 20%, and the same occurs also for the CTFSI peak. Obviously, post-deposition of 0.7 ML Li at RT leads already to a significant formation of F-and C-containing volatile product species that can desorb instantaneously at room temperature. A similar trend (significant desorption) is observed for the intensity of the S-containing peaks. In contrast, for the O1s, N1s and the BMP-related C1s peaks the total intensities remain about constant. Obviously, in these latter cases the intensity loss in the TFSI related peaks is essentially compensated by an intensity gain in the new peaks, indicating that the decomposition of TFSI-like species results also in solid species that remain adsorbed on the surface. In addition, also volatile, S-containing molecules are formed that can desorb instantaneously. These trends continue upon annealing the adlayer covered graphite (0001) sample to 400 K.