Fig. 1

Reflection-absorption infrared spectra of thick CH3CN ice (850 ML; upper panel) and of thick CH3NC ice (890 ML; lower panel), condensed at 90 K on polycrystalline gold. Indicated assignments are detailed in Table 1. Peaks denoted with (*) correspond to identified combination modes. Structures observed at ≈2350 cm-1 are associated with a modification of the reference spectra due to a change of gaseous CO2 concentration in the spectrometer during the experiment time.
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