Publication Abstracts

Tucker et al. 1974

Tucker, K.D., M.L. Kutner, and P. Thaddeus, 1974: The ethynyl radical C2H — A new interstellar molecule. Astrophys. J., 193, L115-L119, doi:10.1086/181646.

Four new interstellar lines have been detected in a number of galactic sources with derived rest frequencies of 87,317.05, 87,328.70, 87,402.10, and 87,407.23 MHz. Based on laboratory ESR data in the solid state, these lines have been positively identified as hyperfine components of the N = 1 → 0 transition of the ethynyl radical C2H. The astronomical observations yield precise values for the C2H rotation, spin-doubling, and hyperiine constants, namely, 2B0-4D0 = 87,348.74±0.19 MHz, γ = -62.57±0.13 MHz, b = 40.24±0.43 MHz, and c = 12.23±0.35 MHz. Ethynyl is apparently one of the most abundant interstellar polyatomic molecules with column densities in the best sources ∼1015 cm-2. In the Orion Nebula the north-south extent of C2H emission is nearly a quarter of a degree.

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BibTeX Citation

  author={Tucker, K. D. and Kutner, M. L. and Thaddeus, P.},
  title={The ethynyl radical C2H — A new interstellar molecule},
  journal={Astrophys. J.},

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RIS Citation

ID  - tu09100s
AU  - Tucker, K. D.
AU  - Kutner, M. L.
AU  - Thaddeus, P.
PY  - 1974
TI  - The ethynyl radical C2H — A new interstellar molecule
JA  - Astrophys. J.
VL  - 193
SP  - L115
EP  - L119
DO  - 10.1086/181646
ER  -

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