Fig. 9. C 1s and N 1s core level spectra in 80° emission for different times after the deposition of 1.7 nm of [C₁C₁Im][Tf₂N] on Ag(111) at RT. The nominal ratios are C_anion : C_hetero = 2 : 5 in the C 1s spectrum and N_cation : N_anion = 2 : 1 in the N 1s spectrum. Note how the anion signals dominate in the early stages while the expected ratios are approached only towards the end of the spreading process.