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Fig. 3


TPD of 4 ML O2 reacting with 6 ML of D atoms, on a silicate substrate held at 10 K pre-covered with 25 ML of ASW. Top panel: HDO (blue circles), O2 (red squares), and HDO2 (black triangles). HDO and O2 curves are offset for clarity. Bottom panel: HDO (blue circles) and H2O (cyan circles) TPD signals. The HDO signal has been rescaled, in order to make the dynamics apparent.

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