IR transmittance spectra (2400–1250 cm-1 (4.17–8.0 μm)), in optical depth scale. The top panel shows the spectrum of formamide (20 K) after irradiation at a dose of 12 eV/16u with 200 keV H+ ions (full line). The main species formed after irradiation are labelled. The spectrum obtained before irradiation is also shown for comparison (dotted line). The middle panel shows the spectrum of a mixture H2O:CH4:N2 (1:1:1) deposited at 12 K and while being irradiated by ions at a dose of about 300 eV/16u. Absorption features assigned to HNCO and NH2HCO are labelled. The bottom panel shows the spectrum of a mixture H2O:CH4:NH3 (1:1:1) as deposited at 17 K and after irradiation with 200 keV H+ of about 240 eV/16u. Absorption features assigned to HNCO and NH2HCO are labelled.
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