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F 1s and C 1s spectra in 0° and 80° emission for the clean Ag(111) crystal (I), after deposition of 0.6 ML of [C8C1Im][Tf2N] at 90 K (II), after deposition of 1.3 ML of [C8C1Im][PF6] on top of the existing film of [C8C1Im][Tf2N] at 90 K (III), and after heating the composite IL film to 300 K (IV).
