Statistics – Computation
Scientific paper
Dec 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...323l.145l&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 323, Dec. 15, 1987, p. L145-L148.
Statistics
Computation
19
Cyanoacetylene, Infrared Lasers, Interstellar Matter, Laser Spectroscopy, Molecular Ions, Radiation Sources, Absorption Spectra, Computational Chemistry, Infrared Spectra, Positive Ions
Scientific paper
The nu1 fundamental band (N-H stretch) of protonated cyanoacetylene HC3NH(+) has been observed in absorption for the first time with a difference-frequency laser as a radiation source around 3.1 microns. The ion was generated in a modulated hollow-cathode discharge through a gas mixture of H2 and HC3N. The molecular constants in the ground state as well as in the excited state have been determined from a least-squares analysis of the IR data. The accuracy of the molecular constants is good enough to predict the rotational transition frequencies with uncertainties of less than 1 MHz for the low-J lines and a few MHz for lines in the 200-300 GHz region. The predicted rotational transition frequencies will enable searches to be made for this species in interstellar space.
Amano Takanobu
Lee Sang K.
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