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Table 2

Experimental details for all initially layered O2–H2O, 18O2–H2O, and pure H2O ice experiments.

Experiment Species O2/H2O (ML) Isothermal T (K) Isothermal duration (h)
0 H2O 0/42 40 4

1 O2–H2O 23/41 25 3
2 O2–H2O 11/40 30 4
3 O2–H2O 11/41 35 4
4 O2–H2O 10/42 40 4
5 O2–H2O 12/39 45 4

6 O2–H2O 15/60 40 4
7 O2–H2O 7/79 40 4

8 18O2–H2O 5/40 35 4
9 18O2–H2O 5/40 40 4
10 18O2–H2O 5/41 45 4

4a O2–H2O 11/42 40 4
4b O2–H2O 16/39 40 4
4c O2–H2O 16/42 40 4
4d O2–H2O 11/43 40 4
4e O2–H2O 19/41 40 30

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