Physics – Medical Physics
Scientific paper
Sep 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010jchph.133j4303b&link_type=abstract
Journal of Chemical Physics, Volume 133, Issue 10, pp. 104303-104303-7 (2010).
Physics
Medical Physics
2
Ab Initio Calculations, Density Functional Theory, Extraterrestrial Life, Ice, Organic Compounds, Oxidation, Photochemistry, Molecular And Chemical Processes And Interactions, Processes Caused By Visible And Uv Light, Other Topics In Biological And Medical Physics
Scientific paper
The UV photoirradiation of pyrimidine in pure H2O ices has been explored using second-order Møller-Plesset perturbation theory and density functional theory methods, and compared with experimental results. Mechanisms studied include those starting with neutral pyrimidine or cationic pyrimidine radicals, and reacting with OH radical. The ab initio calculations reveal that the formation of some key species, including the nucleobase uracil, is energetically favored over others. The presence of one or several water molecules is necessary in order to abstract a proton which leads to the final products. Formation of many of the photoproducts in UV-irradiated H2O:pyrimidine=20:1 ice mixtures was established in a previous experimental study. Among all the products, uracil is predicted by quantum chemical calculations to be the most favored, and has been identified in experimental samples by two independent chromatography techniques. The results of the present study strongly support the scenario in which prebiotic molecules, such as the nucleobase uracil, can be formed under abiotic processes in astrophysically relevant environments, namely in condensed phase on the surface of icy, cold grains before being delivered to the telluric planets, like Earth.
Bera Partha P.
Lee Timothy J.
Milam Stefanie N.
Nuevo Michel
Sandford Scott A.
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