Chemical reactions in H2O:CO interstellar ice analogs promoted by energetic heavy ion irradiation

ABSTRACT H2O:CO, at concentrations of (3:2) and (10:1), was condensed on CsI substrate 15 K irradiated with 46-MeV 58Ni11 + ion beam. Radiolysis induced by fast heavy ions analyzed infrared spectroscopy (FTIR). The formation nine molecular species: CO2, H2O2, HCOOH, HCO, H2CO, 13CO2, CH3OH, O3, C3O2 observed. For both concentrations, carbon dioxide (CO2), formaldehyde (H2CO), formic acid (HCOOH), hydrogen peroxide (H2O2) are the most abundant products species, tricarbon (C3O2) is much less abundant. Precursor destruction cross-sections determined. CO cross-section for concentration almost five times higher than that water, while those (10:1) practically same. Atomic sputtering yields estimated two ice films, total mass sputtered approximately 2.5 × 106 u per impact. These results contribute to figure out chemical pathways compounds synthesized from organic species (H2O CO) observed in ices grain mantles circumstellar envelopes interstellar medium. In additional, finding reveal astronomical percentages comparable obtained after eV molec?1 deposited dose current experiments compared relative molecules solid phase MYSO, LYSO, BG Stars, Comets.