Carbonic acid production in H~2O:CO~2 ices. UV photolysis vs. proton bombardment
摘要：
We have the unique ability to perform ultraviolet photolysis ( ~ 10 eV per photon) and ion irradiation (0.8 MeV p^+) in the same experimental set-up, with ices created under identical conditions. We present experiments that show the formation of carbonic acid (H_2CO_3) from H_2O:CO_2 ice mixtures exposed to either UV photons or high-energy protons. CO and CO_3 were also formed in these experiments. Results show that while H_2CO_3 is readily formed by p^+ bombardment, its formation by UV photolysis is limited by the penetration of UV photons into the ice. H_2CO_3 production pathways are investigated. Intrinsic IR band strengths are determined for eight IR features of H_2CO_3. Implications for ices found in various astrophysical environments are discussed.
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关键词：
MOLECULAR DATA MOLECULAR PROCESSES METHODS: LABORATORY COMETS: GENERAL PLANETS AND SATELLITES: GENERAL ISM: MOLECULES
DOI：
doi:10.1086/301330
被引量：
年份：
2000
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