Molecular Parameters for C7H

NRAO National Radio Astronomy Observatory


Laboratory measurements by M. J. Travers, M. C. McCarthy, C. A. Gottlieb and P. Thaddeus, 1996, Astrophysical Journal Vol 465 p. L77.


  • Approximate Structure:
  • Electronic Ground State Doublet Pi
  • Aeff = 769735(16) MHz (25.68 cm-1)
  • B = 875.48405(6) MHz
  • D x 10^6 = 11.280 (4) MHz
  • p + 2q = 1.574(11)
  • q = -.0164(2)
  • Doublet Pi 1/2 Rotational Constant Beff=874.4869(2) MHz Deffx10^6=10.04(2) (Travers et al. 1996)
  • Doublet Pi 3/2 Rotational Constant Beff=876.4812(2) MHz Deffx10^6=12.53(1) (Travers et al. 1996)
  • Dipole Moment 5.95 Debye (est.)


    • Interstellar detection by M. Gu\'elin, J. Cernicharo, M. J. Travers, M. C. McCarthy, C. A. Gottlieb, P. Thaddeus, M. Ohishi, S. Saito and S. Yamamoto In Astronomy \& Astrophysics, January 1997 (in press).

    Five lines observed toward the evolved carbon star IRC+10216 indicate the molecule is four times less abundant than C8H and twenty times less abundant than C5H in the molecular shell surrounding the star. Typically, in the J=48.5 -> 47.5 transitions near 85 GHz, an integrated line intensity of 0.08(2) was observed in each of the lambda-doublet components with the IRAM 30m telescope.


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