Identification and yield of carbonic acid and formaldehyde in irradiated ices

Details Identification and yield of carbonic acid and formaldehyde in irradiated ices Identification and yield of carbonic acid and formaldehyde in irradiated ices

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....98.5505d&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. E3, p. 5505-5510.

Physics

22

Carbonic Acid, Comet Nuclei, Formaldehyde, Ice, Mars Surface, Proton Irradiation, Absorptivity, Infrared Spectra, Planets, Satellites, Carbonic Acid, Formaldehyde, Ice, Icy Bodies, Irradiation, Infrared, Spectra, Wavelengths, Carbon Dioxide, Protons, Water Ice, Acetone, Dimethyl Carbonate, Absorption, Refractive Index, Comets, Laboratory Studies, Crystalline, Comparisons, Radiation

Scientific paper

Carbonic acid, (OH)2CO, was tentatively identified in the IR spectrum of a proton irradiated CO2 + H2O ice mixture. In this report, we present additional evidence for a more definitive identification of (OH)2CO with (1) the infrared spectrum of a residue obtained by proton irradiation of CO2 + D2O ice mixture, and (2) the IR spectra of solid phases of formaldehyde (H2CO), acetone (CH3)2CO, and dimethyl carbonate (OCH3)2CO, which are structurally similar to (OH)2CO. IR characteristics (peak frequencies and complex refractive indices of the compounds in point 2) are also reported. In particular, the integrated absorption coefficients for the C-O band for the compounds in point 2 do not vary by more than 20 percent. Based on these values, we estimate the yields of H2CO and (OH)2CO by proton irradiation or ice mixtures. Both H2CO and (OH)2CO are possible irradiation products of cometary and planetary ices.

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