Global analysis of several bands of the CF4 molecule

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https://hdl.handle.net/2142/91433

Author(s)

Boudon, Vincent

Contributor(s)

Issue Date

2016-06-20

Keyword(s)

Spectroscopy in Atmospheric Chemistry

Abstract

Carbon tetrafluoride is a powerful greenhouse gas, mainly of anthropogenic origin. Its absorption spectrum is, however, still badly modeled, especially for hot bands in the strongly absorbing $\nu_3$ region. To overcome this problem, we have undertaken a systematic study of all the lower rovibrational transitions of this molecule. In particular, new far-infrared spectra recorded at the SOLEIL Synchrotron facility give access to bands implying the ``forbidden'' modes $\nu_1$ and $\nu_2$ which have only been investigated previously thanks to stimulated Raman spectroscopy\footnote{V. Boudon, D. Bermejo, R. Z. Mart\'{\i}nez, J. Raman Spectrosc. {\bf 44}, 731?738 (2013).}, that is with a lower accuracy and much less data. Combined with the previous analyses performed in our group\footnote{V. Boudon, J. Mitchell, A. Domanskaya, C. Maul, R
Georges, A. Benidar, W. G. Harter, Mol. Phys. {\bf 109}, 17--18 (2011).}, we thus report here a new global fit of line positions of CF$_4$ by considering several transitions altogether: $\nu_2$, $2\nu_2-\nu_2$, $\nu_4$, $2\nu_4$, $\nu_3$ and $\nu_3-2\nu_2$. This gives a consistent set of molecular parameters that will be of great help for the analysis of hot bands like $\nu_3+\nu_2-\nu_2$. A second separate global fit including the $\nu_1$, $\nu_1-\nu_4$ and $2\nu_1-\nu_1$ bands will also be presented.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

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http://hdl.handle.net/2142/91433

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