Fig. 2

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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. Panel A: LDPI TOF MS spectra of porous amorphous H2O ice (20 ML) collected at 20 K, prior to UV photolysis. Panel B: LDPI TOF MS spectra of porous amorphous H2O ice after UV irradiation with a photon fluence of 2.7 × 1018 photons cm−2. In the plots shown in panels A and B, the labeling of the ions is representative for each full plume; however, for clarity of the figure, we kept the labeling minimal. Panel C: integrated plume profiles of LDPI TOF MS signals for different UV photon fluence increments. Panel D: photodepletion of the H2O column density as a function of UV fluence from repeated experiments with H216O and H218O. Error bars represent the uncertainty regarding the ice thickness of ±1.5 ML.
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