Fig. A.1
Top panel: integrated LDPI TOF-MS signals for an UV-irradiated CH3CN ice at 20 K that is subsequently heated to a temperature of 30 K (black sticks) and 60 K (red sticks). The identification of CH4 formation in the ice becomes visible when subtracting the 60 and 30 K data as CH4 thermally desorbs around 40 K. This is shown in the lower panel; at m/z = 15 and 16 this results in a negative value.
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