Cumulenic and heterocumulenic anions : potential interstellar species?

Blanksby, Stephen J., McAnoy, Andrew M., Dua, Suresh, & Bowie, John H. (2001) Cumulenic and heterocumulenic anions : potential interstellar species? Monthly Notices of the Royal Astronomical Society, 328(1), pp. 89-100.

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A recent theoretical investigation by Terzieva & Herbst of linear carbon chains, C-n where n greater than or equal to 6, in the interstellar medium has shown that these species can undergo efficient radiative association to form the corresponding anions. An experimental study by Barckholtz, Snow & Bierbaum of these anions has demonstrated that they do not react efficiently with molecular hydrogen, leading to the possibility of detectable abundances of cumulene-type anions in dense interstellar and circumstellar environments. Here we present a series of electronic structure calculations which examine possible anionic candidates for detection in these media, namely the anion analogues of the previously identified interstellar cumulenes CnH and Cn-1CH2 and heterocumulenes CnO (where n = 2-10). The extraordinary electron affinities calculated for these molecules suggest that efficient radiative electron attachment could occur, and the large dipole moments of these simple (generally) linear molecules point to the possibility of detection by radio astronomy.

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ID Code: 71643
Item Type: Journal Article
Refereed: Yes
Additional URLs:
Keywords: molecular processes, ISM , abundances, ISM , lines and bands, ISM , molecules, infrared , ISM, radio lines , ISM, correlated molecular calculations, gaussian-basis sets, gas-phase, photoelectron-spectroscopy, laboratory detection, electron-attachment, astronomical detection, carbon monoxides, radical-anions, chemistry
DOI: 10.1046/j.1365-8711.2001.04836.x
ISSN: 1365-2966
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2001 Royal Astronomical Society
Deposited On: 21 May 2014 02:34
Last Modified: 05 Feb 2015 03:08

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