Fig. A.2
Top panel: integrated LDPI TOF-MS signals for an UV-irradiated CH3CN ice at 20 K that is subsequently heated to a temperature of 60 K (black sticks) and 130 K (red sticks). The identification of HCN formation in the ice becomes visible when subtracting the 130 and 60 K data as HCN thermally desorbs around 120 K. This is shown in the lower panel; at m/z = 27 this results in a negative value. In addition, thermal desorption of remaining CH4 trapped in the ice is observed at m/z = 16.
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