2022MNRAS.511.2491D

H₂O:CO, at concentrations of (3:2) and (10:1), was condensed on CsI substrate at 15 K and irradiated with 46-MeV ⁵⁸Ni^11 +^ ion beam. Radiolysis induced by fast heavy ions was analyzed by infrared spectroscopy (FTIR). The formation of nine molecular species: CO₂, H₂O₂, HCOOH, HCO, H₂CO, ¹³CO₂, CH₃OH, O₃, and C₃O₂ was observed. For both concentrations, carbon dioxide (CO₂), formaldehyde (H₂CO), formic acid (HCOOH), and hydrogen peroxide (H₂O₂) are the most abundant products species, and tricarbon dioxide (C₃O₂) is much less abundant. Precursor destruction cross-sections and formation cross-sections of products are determined. The CO destruction cross-section for the (3:2) concentration is almost five times higher than that of water, while those for the (10:1) concentration are practically the same. Atomic sputtering yields are estimated for the two ice films, the total mass sputtered is approximately 2.5 x 10⁶ u per impact. These results contribute to figure out the chemical pathways of compounds synthesized from the two most abundant organic species (H₂O and CO) observed in the ices of grain mantles of the circumstellar envelopes and interstellar medium. In additional, the finding results reveal that molecular astronomical percentages are comparable to those obtained after 15 eV molec^–1 of deposited dose in current experiments compared with the relative concentration of molecules in solid phase observed in MYSO, LYSO, BG Stars, and Comets.