2008ApJ...677.1132T -
Astrophys. J., 677, 1132-1139 (2008/April-3)
Laboratory and astronomical detection of the negative molecular ion C3N–.
THADDEUS P., GOTTLIEB C.A., GUPTA H., BRUNKEN S., McCARTHY M.C., AGUNDEZ M., GUELIN M. and CERNICHARO J.
Abstract (from CDS):
The negative molecular ion C3N– has been detected at millimeter wavelengths in a low-pressure laboratory discharge, and then with frequencies derived from the laboratory data 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 to 0.03 km/s or better in equivalent radial velocity. Four transitions of C3N– were detected in IRC+10216 with the IRAM 30 m telescope at precisely the frequencies calculated from the laboratory measurements. The column density of C3N– is 0.5% that of C3N, or approximately 20 times greater than that of C4H– relative to C4H. The C3N– abundance in IRC+10216 is compared with a chemical model calculation by Petrie & Herbst. An upper limit in TMC-1 for C3N– relative to C3 N (<0.8%) and a limit for C4H– relative to C4H (<0.004%) that is 5 times lower than that found in IRC+10216, were obtained from observations with the NRAO 100 m Green Bank Telescope (GBT). The fairly high concentration of C3N– achieved in the laboratory implies that other molecular anions containing the CN group may be within reach.
Abstract Copyright:
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Journal keyword(s):
ISM: Molecules - Line: Identification - Molecular Data - Molecular Processes - Radio Lines: ISM
Simbad objects:
3
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