Fig. 2From: Possible modifications of parchment during ion beam analysisFTIR-ATR spectra of a sample irradiated with 2.3 MeV protons, applying 250 pA current until the accumulated charge reached 5 µC/cm2 (red), as well as of a reference, i.e. non-irradiated area on the same piece of parchment (blue)Back to article page