Detection of a new molecular ion HC3NH(+) in TMC-1

Details Detection of a new molecular ion HC3NH(+) in TMC-1 Detection of a new molecular ion HC3NH(+) in TMC-1

Jan 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...420l..95k&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 420, no. 2, p. L95-L97

Astronomy and Astrophysics

Astronomy

15

Cyanoacetylene, Dark Matter, Doppler-Fizeau Effect, Microwave Spectra, Molecular Clouds, Radio Astronomy, Radio Spectra, Spectroscopy, Atmospheric Density, Chemical Reactions, Radio Telescopes, Spectrometers, Temperature

Scientific paper

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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