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Computation of Frequencies and Linestrengths for Triatomic Molecules of Astronomical Interest

Published online by Cambridge University Press:  12 April 2016

Steven Miller ,
Jonathan Tennyson ,
Hugh R.A. Jones  and
Andrew J. Longmore
Steven Miller
Affiliation:
Department of Physics and Astronomy, University College London, Gower St., London WC1E 6BT, U.K.
Jonathan Tennyson
Affiliation:
Department of Physics and Astronomy, University College London, Gower St., London WC1E 6BT, U.K.
Hugh R.A. Jones
Affiliation:
Royal Observatory Edinburgh, Blackford Hill, Edinburgh EH9 3HJ, U.K.
Andrew J. Longmore
Affiliation:
Royal Observatory Edinburgh, Blackford Hill, Edinburgh EH9 3HJ, U.K.

Extract

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Molecular bands have been used as a diagnostic of spectral type since the 1860's. TiO was first identified as the dominant feature in optical spectra of cool giants in 1904 (Fowler 1904). Many diatomic molecules have now been included (e.g. Jørgensen & Larsson 1990) in detailed calculations of stellar opacity and attention is starting to focus on the incorporation of accurate data for triatomics. Triatomic molecules have a much greater density of states than diatomics; bending vibrational bands - generally lower in frequency than bond-stretching modes - may contribute considerably to “filling in” spectral gaps.

Type
Research Article
Information
International Astronomical Union Colloquium , Volume 146: Molecules in the Stellar Environment , 1994 , pp. 296 - 309
Copyright
Copyright © Springer-Verlag 1994

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