Ion implantation in ices

Details Ion implantation in ices Ion implantation in ices

May 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000nimpb.166...13s&link_type=abstract

Nuclear Instruments and Methods in Physics Research Section B, Volume 166, p. 13-18.

Physics

2

Scientific paper

We have studied, by in situ infrared spectroscopy, some effects due to ion implantation in frozen ices. In particular mixtures containing C, N and O atoms (e.g., N2:H2O:CH4) have been irradiated with unreactive (noble gases) ions: the resulting alteration of the frozen sample induces the formation of other molecules (e.g., CO2, R/-OCN, CO and HCN) and of a refractory organic residue. Similar products are formed when mixtures containing only C and O atoms (e.g., H2O:CH4) are irradiated with N ions, i.e. molecular species that include the projectile are formed. These results are important, in particular for their applications to planetary physics. In planetary environments ice thickness is usually much larger than the penetration depth of the relevant ion populations (solar wind ions, magnetospheric particles, etc.) and ion implantation phenomena are expected. Our results indicate that some molecular species observed on icy planetary surfaces could not be native of that object but formed by ion irradiation and/or by implantation of reactive ions.

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