Fig. 3
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LDPI TOF MS signals for a UV-irradiated H2O:CO2 ice at 100:11 ratio. The lowest trace in each panel shows the signal without UV irradiation. Peaks at m∕z = 18n + 1, where n = 1, 2 represent protonated water clusters formed upon laser desorption of water ice and do not contribute to the chemistry in the ice. The inset is a zoom on the intensity scale for the higher masses.
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