Physics – Condensed Matter
Scientific paper
Jun 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aps..shk.t3004g&link_type=abstract
American Physical Society, 16th APS Topical Conference on Shock Compression of Condensed Matter, June 28-July 3, 2009, abstract
Physics
Condensed Matter
Scientific paper
We present herein ab initio molecular dynamics (MD) simulations of peptide bond synthesis in shock compressed astrochemical mixtures such as found in comets and other celestial bodies. Given the likelihood of a CO2-rich primitive atmosphere, it is probable that impact processes of icy interstellar masses were partially responsible for the creation of pre-biotic peptide (C---N) bonded materials on early Earth. To this end, we have studied C---N bond formation in a prototypical interstellar ice mixture shock compressed up to velocities close to Earth's escape velocity. Our results show that high shock velocities can drive the synthesis of a number of short-lived, exotic C---N bonded species at much high pressure-temperature conditions than previously thought. Stable amino acids are then formed upon quenching to lower temperature. Knowledge of chemical properties of these species under extreme thermodynamic conditions is essential for a complete understanding of the role of these impact processes in the formation of life-building compounds.
Fried Laurence E.
Goldman Nir
Reed Evan
William Kuo I.-F.
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