Fig. 4

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LDPI TOF MS spectra of H2O ice at 20 K prior and during the UV irradiation, followed by their quantitative analysis. Top panel: abundance of H2O during the UV photolysis of H2O with and without an argon coating at 20 K. Error bars represent the uncertainty regarding the ice thickness of ±1.5 ML. Bottom panel: the difference in the H2O abundance between the H2O and H2O + Ar experiments resulting in an H2O photodesorption rate. Error bars represent the propagated uncertainty regarding the ice thickness, with a final value equal to ±2.1 ML. The data were fitted with a linear function (R2 = 0.94).
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