Final relative integrated optical depth Af/Ai of C-H stretching modes, obtained after infinite irradiation as function of the electronic cross section Se for the different irradiation ion/energy of a-C:H 1 samples. Two different fits corresponding to the linear increase of the recombination volume V with Se (Eq. (6)) are plotted: the solid line (fit 1) is the best fit, and the dashed line (fit 2) represents an extreme fit for which the asymptotic Af/Ai are the highest for low Se. The coloured arrows represent the Se range of the few major cosmic ray elements.
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