Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apj...513..305m&link_type=abstract
The Astrophysical Journal, Volume 513, Issue 1, pp. 305-310.
Astronomy and Astrophysics
Astronomy
11
Ism: Molecules, Line: Identification, Molecular Data, Molecular Processes, Radio Lines: Ism
Scientific paper
The highly polar ring-chain carbenes HC_4N and HC_6N, formed by substituting either CN or CCCN for a hydrogen atom in cyclopropenylidene (c-C_3H_2), were detected in a supersonic molecular beam with a Fourier transform microwave spectrometer. Seven a- and four b-type rotational transitions of HC_4N and 11 a-type transitions of HC_6N, each with resolved nitrogen nuclear quadrupole hyperfine structure, were measured between 6 and 21 GHz, yielding precise values for the three rotational constants, the leading centrifugal distortion constants, and the quadrupole coupling constants. Like the hydrocarbon carbenes C_5H_2, C_7H_2, and C_9H_2, both new molecules have a planar ring-chain structures and singlet electronic ground states. The strongest lines of HC_4N can be detected with a signal-to-noise ratio exceeding 10 in a total integration time of less than 1 s, but the lines of HC_6N were nearly 100 times weaker.
Chen Wei
Gottlieb Carl A.
Grabow Jens-Uwe
McCarthy Mary C.
Thaddeus Patrick
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