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Evolution of the integrated intensity of characteristic a-C:H bands upon electron irradiation. Black dots: CH stretching band (3100-2750 cm-1), small pink circles: CH stretching band from reference [26], blue circles, C=C aromatic stretching (1670-1500 cm-1), red triangles: aromatic CH bending vibrations (950-750 cm-1). The integrated intensities are normalized to 1 at the maximum. The lines are just to guide the eye.
