Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978ap%26ss..55..285a&link_type=abstract
Astrophysics and Space Science, vol. 55, no. 2, May 1978, p. 285-297.
Astronomy and Astrophysics
Astrophysics
4
Interstellar Chemistry, Isotope Effect, Meteoritic Composition, Plasma Chemistry, Space Environment Simulation, Abundance, Cold Plasmas, Mass Spectroscopy, Nitrogen Isotopes, Nitrogen Oxides, Reaction Kinetics
Scientific paper
Laboratory model experiments are discussed which were undertaken to clarify some of the mechanisms responsible for the isotope fractionation observed in interstellar clouds and meteorite materials. Initial studies were performed in the plasma reaction system (N-14, N-15)-O by exciting the reactant gases in a LN2-cooled reaction vessel with an 800-W RF generator operating at 13.5 MHz; care was taken to avoid any possible source of CO in the reactant gases or in the various processing steps. The mass spectrometer used in the study is described, the total error is evaluated, and the results are examined in terms of the nitrogen isotope fractionation at low and high concentrations of reactant oxygen, the oxygen isotope fractionation, and speculative reaction mechanisms in the nitrogen isotope fractionation. Possible causes of the isotope effects observed in interstellar clouds and meteorite materials are considered.
Arrhenius Gustaf
Fitzgerald Ryan
Markus Selmke
Simpson Carlos
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