Evaluation of the degradation cross-cection as stopping power dependence for pure and mixture molecular samples at cryogenic temperatures
Résumé
Ices in interstellar and planetary environments are constantly altered by cosmic radiation. Using FTIR spectroscopy, we analyse radiation-induced changes in ices containing H₂O, CO, CO₂, and CH₃OH, molecules abundant in the Solar System and interstellar medium. Molecular degradation is quantified by apparent cross-sections that scale with the electronic stopping power (Sₑ). Literature data reveal a power-law dependence, σd ∝ Sₑⁿ, influenced by thickness, sputtering yield, and radiochemical effects. This empirical relationship serves as a benchmark for assessing molecular stability and the interplay between sputtering and radiolysis, improving models of chemical evolution in astrophysical ices
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