Aliphatic C-H destruction cross section σd as function of the electronic cross section Se for the different ion/energy irradiation of the a-C:H samples. The values corresponding to the C-H stretching modes at 3.4 μm (in black), the CH2 bending mode at 6.85 μm (in red), and the CH3 bending mode at 7.25 μm (in green) are represented for both a-C:H 1 (filled dots) and a-C:H 2 (squares). The best fit and the fits with extreme values of α are plotted (the corresponding values of α are written). The coloured arrows represent the Se range of the few major cosmic ray elements.
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