The submillimeter-wave spectrum of the doubly deuterated species of methyl formate HCOOCD2H⋆
1 LISA, UMR 7583 CNRS – Universités Paris Est Créteil et Paris Diderot, 61 avenue du Général de Gaulle, 94010 Créteil, France
2 Laboratoire de Physique des Lasers, Atomes et Molécules, UMR 8523 CNRS – Université Lille I, Bât. P5, 59655 Villeneuve d’ Ascq Cedex, France
3 Centre for Theoretical and Computational Chemistry (CTCC), Department of Chemistry, University of Oslo, PO Box 1033 Blindern, 0315 Oslo, Norway
4 Sciences Chimiques de Rennes, UMR 6226 CNRS – ENSCR, Avenue du Général Leclerc, CS 50837, 35708 Rennes Cedex 7, France
Received: 27 February 2012
Accepted: 17 April 2012
Context. Astronomical surveys of interstellar molecules, such as those that will be available with the very sensitive ALMA telescope, require preliminary laboratory investigations of the microwave and submillimeter-wave spectra of new molecular species to identify these in the interstellar media.
Aims. We build a linelist that should allow us to detect HCOOCD2H, provided it is present in the interstellar media in a suitable concentration.
Methods. The experimental spectra of HCOOCD2H have been recorded in the microwave and submillimeter-wave energy range. Line frequencies were analyzed using an internal axis method-like treatment taking into account the CD2H internal rotation.
Results. 5933 lines of HCOOCD2H have been assigned and their frequencies were reproduced with a unitless standard deviation⋆⋆ of 1.6. A linelist with calculated frequencies and intensities was built and spans the 50 − 660 GHz spectral region. The frequency accuracy is better than 0.1 MHz.
Conclusions. The pure rotation spectrum of the CD2H-methyl formate isotopolog (HCOOCD2H) has been observed in laboratory for the first time.
Key words: methods: data analysis / surveys / catalogs / molecular data / techniques: spectroscopic
Tables 3, 6, and 10 are available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (220.127.116.11) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/543/A46
© ESO, 2012