Journal Article

Cyanide/isocyanide abundances in the interstellar medium – I. Theoretical spectroscopic characterization

M. L. Senent, F. Dumouchel and F. Lique

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 420, issue 2, pages 1188-1194
Published in print February 2012 | ISSN: 0035-8711
Published online January 2012 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2011.20132.x
Cyanide/isocyanide abundances in the interstellar medium – I. Theoretical spectroscopic characterization

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Modelling molecular abundances in the interstellar medium requires accurate molecular data. In this work, structural and spectroscopic properties of a series of metal cyanides/isocyanide species containing Na, Mg, Al and Si are calculated and compared using highly correlated ab initio calculations. The metal substitution effect on molecular properties is discussed. Isomerization pathways and transitions states are detailed.

NaCN shows three isomeric structures, one T shaped and two linear forms, whereas the remaining compounds display two linear minimum energy geometries. For the first time, NaCN secondary minima are described.

Second-order perturbation theory spectroscopic parameters are determined from an anharmonic RCCSD(T)/aug-cc-pV5Z force field. Very accurate rotational constants are calculated using a complete basis set and taking into account vibrational effects and the structure variation with core electron correlation. For l-SiCN and l-SiNC, spin–orbit parameters are also provided. Present theoretical results are compared with available experimental data attaining a good agreement.

Keywords: ISM: abundances; ISM: molecules

Journal Article.  3750 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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