Abundance evolution of the parent C₂H₂ species (left panel) and the newly formed reaction products (right panel) in the 200 keV H⁺ radiolysis of C₂H₂:H₂O mixed ice over H⁺ fluence of 6.0 × 10¹⁴ protons cm⁻² (i.e., ~ 16.4 eV 16u-molecule⁻¹). The derived absolute abundances are normalized to the initial C₂H₂ abundance. The dashed lines present the fitting results, and the solid lines connecting data are only for clarity.