Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apjs..104..329f&link_type=abstract
Astrophysical Journal Supplement v.104, p.329
Astronomy and Astrophysics
Astronomy
15
Line: Identification, Molecular Data
Scientific paper
The rotational spectrum of propionitrile (C2H5CN) has been measured in the frequency range from 8 to 200 GHz, where 1461 transitions with J ≤ 70 and Ka ≤ 21 in the ground vibrational state have been newly assigned. A total of 2418 transitions including the 957 transitions measured previously below 610 GHz have been analyzed on the basis of a Watson A-reduced Hamiltonian. A complete set of quartic and sextic distortion constants and five octic distortion constants have been obtained with a good accuracy. In addition, newly assigned Ka b-type transitions have enabled us to determine an octic distortion constant LK for the first time. The determined molecular constants can predict more precisely the frequencies of b-type transitions. These calculated frequencies will be useful in assigning interstellar spectral lines to be detected by radio telescopes.
Fukuyama Yoshimitsu
Odashima Hitoshi
Takagi Kojiro
Tsunekawa Shozo
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