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Theoretical Electronic and Rovibrational Studies for Anions of Interest to the DIBs

Published online by Cambridge University Press:  21 February 2014

R. C. Fortenberry
R. C. Fortenberry*
Affiliation:
NASA Ames Research Center, Moffet Field, CA 94035, USA email: [email protected]
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Abstract

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The dipole-bound excited state of the methylene nitrile anion (CH2CN−) has been suggested as a candidate carrier for a diffuse interstellar band (DIB) at 803.8 nm. Its corresponding radical has been detected in the interstellar medium (ISM), making the existence for the anion possible. This work applies state-of-the-art ab initio methods such as coupled cluster theory to reproduce accurately the electronic excitations for CH2CN− and the similar methylene enolate anion, CH2CHO−. This same approach has been employed to indicate that 19 other anions may possess electronically excited states, five of which are valence in nature. Concurrently, in order to assist in the detection of these anions in the ISM, work has also been directed towards predicting vibrational frequencies and spectroscopic constants for these anions through the use of quartic force fields (QFFs). Theoretical rovibrational work on anions has thus far included studies of CH2CN−, C3H−, and is currently ongoing for similar systems.

Keywords

astrochemistrymolecular dataISM: moleculesinfrared: ISMradio lines: ISMultraviolet: ISM
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 9 , Symposium S297: The Diffuse Interstellar Bands , May 2013 , pp. 344 - 348
Copyright
Copyright © International Astronomical Union 2014 

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