Volume 549, January 2013
|Number of page(s)||4|
|Section||Atomic, molecular, and nuclear data|
|Published online||10 January 2013|
The extended spectroscopic database for deuterated species of formamide up to 1 THz ⋆
Laboratoire de Physique des Lasers, Atomes, et Molécules, UMR CNRS 8523,
Université de Lille 1,
Villeneuve d’Ascq Cedex,
2 Sciences Chimiques de Rennes-École Nationale Supérieure de Chimie de Rennes-CNRS, 35700 Rennes, France
Received: 12 September 2012
Accepted: 1 November 2012
Context. Formamide (HCONH2) is the simplest molecule with a peptide bond detected in the interstellar medium. One of the keys for understanding the mechanisms for forming formamide in massive hot cores is the comparison of the relative abundances of its deuterated isotopologues.
Aims. No deuterated species of formamide have been detected to date mostly owing to the lack of laboratory spectral data, which is limited by cm-wave measurements up to 40 GHz. Therefore, we decided to extend the measurements and the analysis of the rotational spectra of deuterated istopologues of formamide into the terahertz range.
Methods. We measured the rotational spectra of deuterated formamide in the frequency range 150–950 GHz using the Lille fast-scan and solid-state source spectrometers.
Results. The ground vibrational states of 4 different isotopologues of formamide, DCONH2, cis-HCONHD, trans-HCONHD, and HCOND2, were assigned and analysed. The sets of the rotational and centrifugal distortion constants we obtained allow us to calculate accurate predictions of the transition frequencies for deuterated formamide in the frequency range above 1 THz and at least for J < 65 and Ka < 25.
Key words: ISM: molecules / molecular data / submillimeter: ISM / line: identification
Full Table 2 is only available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr(188.8.131.52) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/549/A128
© ESO, 2013
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