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Deuterium hyperfine structure in interstellar C3HD.

M B Bell1, J K Watson, P A Feldman

  • 1Herzberg Institute of Astrophysics, National Research Council of Canada, Ottawa, Ontario.

Chemical Physics Letters
|May 22, 1987
PubMed
Summary
This summary is machine-generated.

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Interstellar cyclopropenylidene-d1 (C3HD) emission reveals deuterium nuclear quadrupole hyperfine structure. The L1498 cloud shows the narrowest spectral linewidths, yielding precise D coupling constants consistent with molecular correlations.

Area of Science:

  • Astronomy and Astrophysics
  • Spectroscopy
  • Physical Chemistry

Background:

  • Cyclopropenylidene (C3H2) is a key molecule in interstellar chemistry.
  • Deuterated molecules serve as important probes of physical conditions and chemical pathways in space.
  • Understanding molecular hyperfine structure aids in identifying and characterizing interstellar species.

Purpose of the Study:

  • To observe and analyze the deuterium nuclear quadrupole hyperfine structure of cyclopropenylidene-d1 (C3HD).
  • To measure the transition 1(10)-1(01) of C3HD in emission from interstellar clouds.
  • To derive the deuterium coupling constants and compare them with theoretical and empirical correlations.

Main Methods:

  • Emission spectroscopy was used to detect the C3HD molecule.
Keywords:
NASA Discipline ExobiologyNASA Discipline Number 52-10NASA Program ExobiologyNon-NASA Center

Related Experiment Videos

  • Observations were conducted towards interstellar molecular clouds, specifically targeting the L1498 cloud for its narrow linewidths.
  • Analysis of the spectral lines allowed for the determination of the deuterium coupling constants (Xzz and eta).

    • Main Results:

    • The deuterium nuclear quadrupole hyperfine structure of the 1(10)-1(01) transition of C3HD was successfully observed.
    • The narrowest observed linewidths were approximately 7 kHz, found in the L1498 cloud.
    • The derived D coupling constants are Xzz = 186.9(1.4) kHz and eta = 0.063(18).

    Conclusions:

    • The observed hyperfine structure provides valuable data for identifying C3HD in interstellar environments.
    • The precise measurements in L1498 demonstrate the potential for high-resolution spectroscopy in studying deuterated molecules.
    • The agreement of the derived D coupling constants with established correlations supports their reliability and aids in understanding molecular properties.