Quantification of O2 formation during UV photolysis of water ice: H2O and H2O:CO2 ices

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Table 1

Summary of the types of performed UV photolysis experiments.

Molecular composition	Composition (%)	Temperature (K)	UV photon fluence (10¹⁸ photons cm⁻²)
H₂¹⁶O	100	20	0–1.8
H₂¹⁸O	100	20	0–1.8
H₂¹⁶O:CO₂	100:11	20	0–1.8
H₂¹⁶O:CO₂	100:22	20	0–2.9
H₂¹⁶O:CO₂	100:44	20	0–2.9
H₂¹⁶O:CO₂:O₂	100:22:2	20	0–2.9
control (H₂O)	100	20, 190	0–1.2

Notes. The total thickness used in all ices is 9 × 10¹⁶ mol cm⁻², which accounts for about 90 ML.

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