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Hot atoms in cosmic chemistry
K Rossler1, H J Jung, B Nebeling
1Institut fur Chemie 1 (Nuklearchemie) der Kernforschungsanlage Julich GmbH, FRG.
Advances in Space Research : the Official Journal of the Committee on Space Research (COSPAR)
|January 1, 1984
Summary
Hot atom chemistry simulates cosmic reactions using energetic particles to study interstellar matter. Solid-state reactions are crucial for forming biomolecule precursors in space.
Area of Science:
- Cosmic Chemistry
- Nuclear Chemistry
- Astrochemistry
Background:
- High-energy reactions and atom-molecule interactions are vital for cosmic chemistry, involving solar wind, cosmic rays, and interstellar gas/dust clouds.
- Energetic "hot" atoms (eV to MeV) are generated through nuclear reactions and recoil processes, relevant to cosmic environments.
Purpose of the Study:
- To simulate interstellar matter reactions using hot atom chemistry in laboratory settings.
- To investigate the chemical fate of radioactive atoms and their reaction products in gaseous and solid states.
Main Methods:
- Utilized radiochemical methods like radio gas chromatography (GC) or high-performance liquid chromatography (HPLC) to track radioactive atoms.
- Generated 2-3 MeV atoms via nuclear reactions (e.g., N(p,alpha) 11C) using a cyclotron with protons or deuterons.
- Studied reaction systems including C/H2O (gas and solid), N/CH4 (solid), and C/NH3 (solid) at 77 K.
Main Results:
- Identified various reaction products such as CO, CO2, CH4, CH3OH, and cyanamide.
- Observed more complex product formation in solid-state reactions compared to gaseous systems.
- Proposed reaction complexes involving hot carbon and multiple target molecules as a key formation mechanism.
Conclusions:
- Solid-state reactions play a significant role in the formation of prebiotic molecules in space.
- Hot atom chemistry provides a valuable low-to-medium dose regime complementary to ion implantation studies.
- The findings contribute to understanding the chemical evolution of interstellar matter and the origins of life.
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