Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...342l.103s&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 342, July 15, 1989, p. L103-L105.
Astronomy and Astrophysics
Astrophysics
38
Electric Dipoles, Electron Transitions, Interstellar Matter, Silicon Carbides, Carbon Stars, Fabry-Perot Spectrometers, Fourier Transformation, Laboratories, Microwave Spectrometers, Molecular Spectra, Stellar Evolution
Scientific paper
A laser-ablation source coupled to a pulsed-nozzle Fabry-Perot Fourier-transform microwave spectrometer is used to investigate the 1(01)-0(00) transition in (Si-28)C2, (Si-29)C2, and (Si-30)C2. The results are presented in tables, and the frequencies are found to be 23.600242(4), 23.257511(8), and 22.937583(8) GHz, respectively. From the electric dipole moment determined for (Si-28)C2, the SiC2 column density toward the evolved carbon star IRC + 10216 is estimated as 2.7 x 10 to the 14th/sq cm. This experimentally based value is shown to be about twice that calculated on the basis of theoretical dipole moments by Thaddeus et al. (1984).
Lovas Francis J.
Matsumura Koji
Suenram Richard D.
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