Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...488..776k&link_type=abstract
Astrophysical Journal v.488, p.776
Astronomy and Astrophysics
Astronomy
7
Ism: Molecules, Line: Identification, Molecular Data, Molecular Processes
Scientific paper
The millimeter and submillimeter spectrum of the FeCO radical in the 3 Sigma - ground electronic state has been observed in the laboratory. The radical was generated by a DC glow discharge in a mixture of Fe(CO)5 and argon. A total of 33 rotational transitions in the three spin sublevels with Omega = 1, 0 were observed in the frequency region between 223 and 372 GHz. The observed frequencies were analyzed using a Hamiltonian for the 3 Sigma - state, and the rotational, centrifugal distortion, spin-spin coupling, and spin-rotation coupling constants were determined. Based on these constants, we obtained the rest frequencies in the 2 and 3 mm regions of FeCO and searched for this radical toward the circumstellar envelope of IRC +10216 and the star-forming regions W3(OH), DR 21, and Sgr B2 with the Instituto de Radioastronomia Milimetrica 30 m radio telescope. The FeCO lines were not detected with an rms noise of 3--7 mK in four sources. The upper limit on the FeCO column density was estimated to be 3 x 1013 cm-2 in IRC +10216.
Kagi Eriko
Kasai Yasuko
Kawaguchi Kentarou
Ungerechts Hans
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