Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...431l.127m&link_type=abstract
The Astrophysical Journal (ISSN 0004-637X), vol. 431, no. 2, pt. 2, p. L127-L130
Astronomy and Astrophysics
Astrophysics
9
Interstellar Space, Molecular Interactions, Radio Spectra, Dipole Moments, Spectrometers, Stellar Magnetic Fields
Scientific paper
The HCCCS radical in its (2)Pi electronic ground state has been studied in the millimeter-wave region. The standard Hamiltonian for an isolated (2)Pi state fits the laboratory measurements of more than 65 lines between 70 and 281 GHz to high accuracy and allows the astronomically most interesting lines in the radio spectrum to be predicted to an uncertainty of 0.2 km/sec or better. The identification was confirmed by the detection of DCCCS with constants within 0.2% to those predicted from HCCCS. Ab initio calculations of HCCCS at the CAS SCF, MP2, MP4, and QCISD levels of theory have also been performed; at the highest level of theory, a bent and a linear isomer are predicted to be within 1.25 kcal/mol in energy. The HCCCS radical may be a good candidate for detection in molecular clouds as well as circumstellar shells, because members of the CnS series are abundant in TMC-1. A search for the (2)Pi1/2 J, F = 2.5, 3 approaches 1.5, 2 transition in TMC-1 indicates that the HCCCS column density is less than, or equal to, that of CCCS.
Gottlieb Carl A.
Gottlieb E. W.
McCarthy Mary C.
Tao F.-M.
Thaddeus Patrick
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