Simultaneous collision-induced transitions in H$_2$O+CO$_2$ gas mixtures
- Fleurbaey, H.
- Mondelain, D.
- Fakhardji, W.
- Hartmann, J.M.
- Campargue, A.
DOIAbstract
International audienceA collision induced absorption (CIA) band has been measured near 6000 cm$^{-1}$ in a spectrum of humidified CO$_2$ recorded by cavity ring down spectroscopy (CRDS) at low pressure (<1 atm). This absorption adds a contribution to the H$_2$O+CO$_2$ continuum mostly originating from far wings of the CO$_2$ and H$_2$O resonance lines broadened by collisions with H$_2$O and with CO$_2$, respectively. The observed CIA corresponds to a simultaneous excitation of 12 CO$_2$ and H$_2$O colliding molecules in the $\nu_3$ antisymmetric and $\nu_1$ symmetric stretching mode, respectively. CRDS spectra recorded near 5940 cm$^{-1}$ with a highly enriched $^{13}$CO$_2$ sample provide a confirmation of the assignment since the measured...
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