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2014A&A...565A..66D - Astronomy and Astrophysics, volume 565A, 66-66 (2014/5-1)

Accurate rest-frequencies of ketenimine (CH2CNH) at submillimetre wavelength.


Abstract (from CDS):

Imine compounds are thought to have a role in the interstellar formation of complex organic species, including pre-biotic molecules. Ketenimine (CH2CNH) is one of the four imines discovered in space. It was identified in Sgr B2(N-LMH) through the detection of three rotational lines in absorption. We present an extensive laboratory study of the ground-state rotational spectrum of CH2CNH at submillimetre wavelengths, aimed at obtaining accurate rest-frequencies for radio-astronomical searches. The investigation was carried out using a source-modulation microwave spectrometer equipped with a cell that is coupled to a pyrolysis apparatus working at 1000°. The spectrum was recorded in the frequency range 80-620GHz with the detection of 150 transitions. The newly measured transition frequencies were analysed with previously available microwave and far-infrared data, yielding accurate rotational constants of CH2CNH, the complete sets of quartic and sextic centrifugal distortion constants, and three octic constants. Several transitions exhibit a hyperfine structure due to the quadrupole and spin-rotation couplings of the 14N nucleus, which were accounted for in the analysis. The determined spectroscopic constants allowed for the computation of a list of highly accurate rest-frequencies for astrophysical purposes in the submillimetre and THz region with 1σ uncertainties that are lower than 0.1km/s in radial equivalent velocity.

Abstract Copyright:

Journal keyword(s): molecular data - methods: laboratory: molecular - techniques: spectroscopic - radio lines: ISM

VizieR on-line data: <Available at CDS (J/A+A/565/A66): table1.dat table3.dat>

Simbad objects: 6

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