Generation Mechanisms of Amino Acids in Interstellar Space via Reactions between Closed-Shell Species: Significance of Higher Energy Isomers in Molecular Evolution

Details Generation Mechanisms of Amino Acids in Interstellar Space via Reactions between Closed-Shell Species: Significance of Higher Energy Isomers in Molecular Evolution Generation Mechanisms of Amino Acids in Interstellar Space via Reactions between Closed-Shell Species: Significance of Higher Energy Isomers in Molecular Evolution

Apr 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006apj...640..823m&link_type=abstract

The Astrophysical Journal, Volume 640, Issue 2, pp. 823-828.

Biology

4

Astrobiology, Astrochemistry, Ism: Molecules, Molecular Processes

Scientific paper

Generation mechanisms of amino acids in the interstellar medium (ISM) are of great importance in connection with the chemical evolution and the origin of life. Ion-molecule reactions and radical-molecule reactions have been studied as possible reaction mechanisms that can occur in ultracold and high-vacuum conditions in the ISM. In this paper, new barrierless reaction pathways generating glycine and its analogs via reactions between closed-shell species have been predicted based on quantum chemical calculations of potential energy surfaces. The ammonium ylide molecule, which is a higher energy isomer of methylamine, can be produced by radiative association between ammonia and the methyl radical cation followed by recombination dissociation. Glycine and its analogs can be generated without thermal activation via a combination of ammonium ylide and some simple molecules such as carbon dioxide. The present results and discussion suggest that higher lying isomers of well-known molecules can be responsible for molecular evolution as well as amino acid generation in the ISM.

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