Infrared spectra (before irradiation) of the different a-C:H and soot samples: IR spectra of samples a-C:H 1 (thickness d ≈ 10 μm) and a-C:H 2 (d ≈ 7 μm) are in the left panel and the soot IR spectrum is in the right panel (d ≈ 5 μm). Spectrum of a-C:H 1 is offset by 1.5 for a better clarity.
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