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Detection of a new molecular ion HC3NH(+) in TMC-1
Kawaguchi, Kentarou; Kasai, Yasuko; Ishikawa, Shin-Ichi; Ohishi, Masatoshi; Kaifu, Norio; Amano, Takayoshi
AA(Nobeyama Radio Observatory, Minamimaki, Minamisaku, Japan), AB(Nobeyama Radio Observatory, Minamimaki, Minamisaku, Japan), AC(Nobeyama Radio Observatory, Minamimaki, Minamisaku, Japan), AD(Nobeyama Radio Observatory, Minamimaki, Minamisaku, Japan), AE(National Astronomical Observatory, Tokyo, Japan), AF(National Astronomical Observatory, Tokyo, Japan)
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 420, no. 2, p. L95-L97 (ApJL Homepage)
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NASA/STI Keywords:
Cyanoacetylene, Dark Matter, Doppler-Fizeau Effect, Microwave Spectra, Molecular Clouds, Radio Astronomy, Radio Spectra, Spectroscopy, Atmospheric Density, Chemical Reactions, Radio Telescopes, Spectrometers, Temperature
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Protonated cyanoacetylene HC3NH(+) has been detected toward TMC-1 for the first time with the Nobeyama 45 m radiotelescope through the J = 5-4 and J = 4-3 transitions. This observation provides the first measurement of the pure rotational transitions for this ion either in the laboratory or in space. From a simultaneous analysis of rotational transition frequencies obtained in this work and the previous infrared data, the most accurate rotational and the centrifugal distortion constants were determined to be B = 4329.0047(10) and D = 0.000478(11) MHz, respectively, with one standard deviation in parentheses. The column density of HC3NH(+) in TMC-1 (cyanopolyyne peak) was determined to be 1.0 (0.2) x 1012/sq cm which is 160 times smaller than that of HC3N and 2.6 times more abundant than HNCCC. The abundances of HC3NH(+), HNCCC, and HCCCN are discussed on the basis of a reaction mechanism recently proposed for the production of HCCCN through neutral-neutral reactions.

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