Figure 1: Evolution of the infrared peak area of C–H functional groups. | Nature Communications

Figure 1: Evolution of the infrared peak area of C–H functional groups.

From: The deuterium/hydrogen distribution in chondritic organic matter attests to early ionizing irradiation

Figure 1

All of the experiments were performed at 30 keV and 300 K. This evolution is documented for (a) polyethylene (PE), (b) polystyrene (PS) and (c) polyethylene terephthalate (PET). For each sample, the intensity of the infrared signal related to CH2 (1,465 cm−1), CH (2,890 cm−1) and ring (3,030 cm−1) are considered. The peak areas (namely ACH2, ACH, Aring) are normalized to the peak area of non-irradiated starting materials. On the three panels, the blue region represents the plateau, whereas structural, compositional and isotopic changes are still functions of the electron dose in the grey area. The doses required to reach 90% of the structural plateau delimit the blue and grey regions of the plots.

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