Carbonic Acid by Ion Implantation in Water_solarCarbon Dioxide Ice Mixtures

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Scientific paper

We present the results of experiments performed by keV ion (He and H) bombardment of frozen mixtures of H_2O:CO_2 and of pure CO_2 ice. Using keV He ions we confirm the already reported measurement of carbonic acid (H_2CO_3) production in an ice mixture of frozen water and carbon dioxide (1:1) after irradiation by 0.7 MeV H ions (Moore, M. H., and R. K. Khanna 1991. Spectrochim. Acta 47, 255-262 Moore, M. H., R. K. Khanna, and B. Donn 1991. J. Geophys. Res. E 96(2), 17,541-17,545.). Contrary to a previous report (Pirronello, V., W. L. Brown, L. J. Lanzerotti, K. J. Marcantonio, and E. H. Simmons 1982. Astrophys. J. 262, 636-640.), formaldehyde (H_2CO), if any, is not a major product. Implantation with hydrogen ions demonstrates that carbonic acid is formed even if the irradiated target is pure CO_2; i.e., the implanted ion is incorporated into the target and forms new bonds. Some possible astrophysical applications on Solar System objects or (pre-solar) interstellar grains are discussed.

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