Fig. 5
Spectra in the 2320–2025 cm−1 region, evolving with the temperature for three icy mixtures after ion exposure. Sample #1 (N2:CH4 + 200 keV H+), Sample #2 (N2:CH4:CO + 200 keV H+), and Sample #3 (N2:CH4:H2O + 200 keV H+). Top panel: IR spectra of the three samples at 17 K, just after ion irradiation. Central panel shows the IR spectra of the three samples at 120 K, during warm-up. Bottom panel: IR spectra of the three corresponding refractory organic residues at room temperature, magnified 10 times for the sake of clarity.
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