High resolution analysis of the ν26 and 2ν9 - ν9 bands of propane: Modeling of Titan's infrared spectrum at 13.4 μm - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Molecular Physics Année : 2010

High resolution analysis of the ν26 and 2ν9 - ν9 bands of propane: Modeling of Titan's infrared spectrum at 13.4 μm

Résumé

Using high-resolution Fourier transform spectra of propane recorded in the 13.4 μm (resolution of 0.002 cm-1) and in the 27.4 μm (resolution 0.0011 cm-1) spectral regions, it was possible to perform a thorough assignment of both the ν26 band at 745 cm-1 and the 2ν9 - ν9 band at about 370 cm-1. This simultaneous assignment was necessary since the 261 and 92 rotational levels interact strongly through an A-type Coriolis interaction. The experimental upper-state rotational levels were fit using a Hamiltonian matrix which takes in account explicitly this strong A-type Coriolis interaction. With this model the experimental energy levels were fit to within their experimental uncertainties and accurate band centers, rotational, centrifugal distortion and coupling constants were determined. The following band centers were derived: νo(ν26) =748.530882(80) cm-1 and νo(2ν9) = 740.29213(10) cm-1. Finally, we show how the use of these new spectral parameters greatly improves the accuracy of modeling of Titan's infrared spectrum at 13.4 m, relative to the currently available GEISA atlas for the same band.

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Dates et versions

hal-00588658 , version 1 (26-04-2011)

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J. M. Flaud, K Kwabia Tchana, W.J. Lafferty, C. Nixon. High resolution analysis of the ν26 and 2ν9 - ν9 bands of propane: Modeling of Titan's infrared spectrum at 13.4 μm. Molecular Physics, 2010, 108 (06), pp.699-704. ⟨10.1080/00268970903501709⟩. ⟨hal-00588658⟩
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