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A laboratory model for interstellar chemical evolution.

Y Ishikawa1, K Kuriki

  • 1Institute of Space and Astronautical Science, Tokyo, Japan.

Advances in Space Research : the Official Journal of the Committee on Space Research (COSPAR)
|January 1, 1983
PubMed
Summary
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This study modeled interstellar chemical evolution using supersonic plasma. Researchers synthesized complex molecules like cyanopolyyne and hydrocarbons, mimicking conditions found in cosmic molecular clouds.

Area of Science:

  • Plasma Physics
  • Astrochemistry
  • Chemical Kinetics

Background:

  • Interstellar chemical evolution is complex, occurring under non-equilibrium conditions.
  • Laboratory experiments are crucial for modeling cosmic chemistry.
  • Matching similarity parameters between cosmic and lab conditions is essential.

Purpose of the Study:

  • To use supersonic plasma flow as a laboratory model for interstellar chemical evolution.
  • To simulate molecular cloud conditions, including temperature and reaction kinetics.
  • To investigate the synthesis of polyatomic molecules from atomic plasma.

Main Methods:

  • Utilizing a supersonic plasma source flow apparatus.
  • Simulating molecular cloud conditions: molecular-ionic reaction fraction, temperature, and non-equilibrium kinetics.

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  • Analyzing the resulting chemical products.

    • Main Results:

    • Supersonic expansion created cold enough plasma to form polyatomic molecules.
    • Cyanopolyyne and unsaturated hydrocarbons were synthesized from atomic plasma.
    • The synthesized molecules are consistent with those found in molecular clouds.

    Conclusions:

    • Supersonic plasma flow is a viable laboratory model for studying interstellar chemistry.
    • The experiment successfully synthesized key molecules relevant to astrochemistry.
    • The findings provide insights into the reaction mechanisms driving chemical evolution in space.