Astronomical Search and Laboratory Spectroscopy of the FeCO Radical

Details Astronomical Search and Laboratory Spectroscopy of the FeCO Radical Astronomical Search and Laboratory Spectroscopy of the FeCO Radical

Jan 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997nro..reptx....k&link_type=abstract

Technical Report, NRO-438 Nobeyama Radio Observatory

Computer Science

Ground State, Rotational Spectra, Iron Compounds, Radio Observation, Radio Spectroscopy, Stellar Envelopes, Spin-Spin Coupling, Rotational States, Radio Telescopes, Radicals, Hamiltonian Functions, Glow Discharges

Scientific paper

The millimeter and sub-millimeter 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 GHz 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 W30H, DR21, and Sgr-B2 with the IRAM 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 1/sq cm in IRC+10216.

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