Experimental and computational study of the radiation-induced decomposition of formaldehyde. Implications to cometary nuclei

Details Experimental and computational study of the radiation-induced decomposition of formaldehyde. Implications to cometary nuclei Experimental and computational study of the radiation-induced decomposition of formaldehyde. Implications to cometary nuclei

Jan 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991oleb...21...39n&link_type=abstract

Origins of Life and Evolution of the Biosphere, Volume 21, Issue 1, pp.39-49

Computer Science

1

Scientific paper

The radiation-induced decomposition of aqueous solutions of formaldehyde was studied at 298 and 77 K in order to obtain an insight into the possible role of ionizing radiation on cometary chemistry. Aqueous solutions of 1.0 mol dm-3 formaldehyde were exposed to γ-radiation in the dose range from 0.01 kGy to 1.2 MGy. The radiation chemical yield of decomposition of formaldehyde was determined to be: G(-CH2(OH)2)=26.3±1.2 at 298 K and G≤0.48 at 77 K. Based on previous estimates of the total dose of ionizing radiation that comets have accumulated over 4.6 billion years, we predict a radiation-induced depletion of formaldehyde as a function of depth in comet nuclei: 100% destruction in the outer layers (0 20 m) and ≈ 10% destruction in the interior layers.

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