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Radiolysis of solid-state nitrogen heterocycles provides clues to their abundance in the early solar system

  • Phillip G. Hammer (a1), Ruiqin Yi (a2), Isao Yoda (a3), H. James Cleaves (a2) (a4) (a5) and Michael P. Callahan (a1)...
Abstract

We studied the radiolysis of a wide variety of N-heterocycles, including many of biological importance, and find that the majority are remarkably stable in the solid-state when subjected to large doses of ionizing gamma radiation from a 60Co source. Degradation of N-heterocycles as a function of dose rate and total dose was measured using high-performance liquid chromatography with UV detection. Many N-heterocycles show little degradation when γ-irradiated up to a total dose of ~1 MGy, which approximates hundreds of millions of years’ worth of radiation emitted in meteorite parent bodies due to slow radionuclide decay. Extrapolation of these results suggests that these N-heterocyclic compounds would be stable in dry parent bodies over solar system timescales. We suggest that the abundance of these N-heterocycles as measured presently in carbonaceous meteorites is largely reflective of their abundance at the time aqueous alteration stopped in their parent bodies and the absence of certain compounds in present-day samples is either due to the formation mechanisms or degradation which occurred during periods of aqueous alteration or thermal metamorphism.

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Corresponding author
Author for correspondence: Michael P. Callahan, E-mail: michaelcallahan914@boisestate.edu
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International Journal of Astrobiology
  • ISSN: 1473-5504
  • EISSN: 1475-3006
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