Volume 549, January 2013
|Number of page(s)||6|
|Section||Atomic, molecular, and nuclear data|
|Published online||13 December 2012|
Accurate ro-vibrational rest frequencies of DC4H at infrared and millimetre wavelengths⋆
1 Dipartimento di Chimica Fisica e InorganicaUniversità di Bologna, Viale del Risorgimento 4, 40136 Bologna, Italy
2 Centro de Astronomia e Astrofísica, Observatório Astronómico de Lisboa, Tapada da Ajuda, 1349-018 Lisboa, Portugal
3 Dipartimento di Chimica “G. Ciamician”, Università di Bologna, via F. Selmi 2, 40126 Bologna, Italy
Received: 13 September 2012
Accepted: 2 November 2012
Context. Diacetylene, C4H2, has been identified in several astronomical environments through its infrared spectrum. In contrast, monodeuterated diacetylene (DC4H) has not been detected in space so far owing to the low isotopic abundance of deuterated species but also to the rather poor laboratory spectroscopic characterisation of this molecule.
Aims. The aim of this work is to provide accurate spectroscopic parameters for DC4H to achieve reliable predictions for both its spectra at millimetre and infrared wavelengths.
Methods. We studied the rotational spectrum of DC4H in the range 85–615 GHz by millimetre-wave spectroscopy and the infrared spectrum below 1000 cm-1 by high-resolution, Fourier-transform spectroscopy. Several pure rotational transitions were recorded in the ground state and in excited vibrational bending states. The three fundamental bands v6, v7, and v8 have been identified and assigned in the infrared spectrum.
Results. The rotational transitions were analysed together with the infrared data in a global fit that produces very accurate ro-vibrational parameters. The observed frequencies and wavenumbers are reported to provide precise guidance for astronomical searches.
Key words: ISM: molecules / line: identification / molecular data / molecular processes / infrared: ISM
Full Table 4 is only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (126.96.36.199) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/549/A38
© ESO, 2012
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