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LABORATORY AND ASTRONOMICAL DETECTION OF THE NEGATIVE MOLECULAR ION C$_3$N$^-$

Please use this identifier to cite or link to this item: http://hdl.handle.net/1811/33380

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Title: LABORATORY AND ASTRONOMICAL DETECTION OF THE NEGATIVE MOLECULAR ION C$_3$N$^-$
Creators: Gottlieb, Carl A.; Thaddeus, Patrick; Brunken, Sandra; McCarthy, Michael C.; AgĂșndez, Marcelino; Cernicharo, Jose; Guelin, Michel
Issue Date: 2008
Abstract: The negative molecular ion C$_3$N$^-$ has been detected at millimeter wavelengths in a low pressure laboratory discharge, and then with frequencies in hand in the molecular envelope of IRC+10216. Spectroscopic constants derived from laboratory measurements of 12 transitions between 97 and 378~GHz allow the rotational spectrum to be calculated well into the submillimeter-wave band. Four transitions of C$_3$N$^-$ were detected in IRC+10216 with the IRAM 30~m telescope at precisely the frequencies calculated from the laboratory measurements. The column density of C$_3$N$^-$ is 0.5\% that of C$_3$N, or approximately 20~times greater than C$_4$H$^-$ relative to C$_4$H. The C$_3$N$^-$ abundance in IRC+10216 is compared with chemical model calculations,}, 210 (1997); E.~Herbst and Y.~Osamura, Astrophys. J., in press (2008).} and observations in TMC--1 with the NRAO 100~m Green Bank Telescope (GBT) are discussed. The fairly high concentration of C$_3$N$^-$ achieved in the laboratory implies that other molecular anions containing the CN group may be within reach.
URI: http://hdl.handle.net/1811/33380
Other Identifiers: 2008-FD-04
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