Examples of the destruction of the aliphatic C-H stretching IR absorption feature around 2900 cm-1 during ion irradiation of a-C:H 1 a), a-C:H 2 b), and soot c). The upper (red) line is the initial spectrum, before irradiation. The optical depth decreases (from green to purple lines in the online coloured version) as the fluence rises. The fluence between two spectra is of the order of few 1012 and few 1013 ions cm-2 for the Si7+ and C6+ irradiations, respectively.
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