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HIGH-RESOLUTION SPECTROSCOPY OF HOBr IN THE FAR- AND NEAR-INFRARED

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dc.creator Orphal, J. en_US
dc.creator Kou, Q. en_US
dc.creator Tchana, F. Kwabia en_US
dc.creator Pirali, O. en_US
dc.creator Flaud, J.- M. en_US
dc.date.accessioned 2006-06-15T20:42:12Z
dc.date.available 2006-06-15T20:42:12Z
dc.date.issued 2003 en_US
dc.identifier 2003-TG-13 en_US
dc.identifier.uri http://hdl.handle.net/1811/21035
dc.description $^{a}$D. G. Johnson, W. A. Traub, K. V. Chance, and K. W. Jucks, Geophys. Res. Lett. 22, 1373 (1995) $^{b}$E. A. Cohen, G. A. McRae, T. L. Tan, R. R. Friedl, J. W. C. Johns, and M. No\""{e}l, J. Mol. Spectrosc. 173, 55 (1995) $^{c}$K. A. Peterson, J. Chem. Phys. 113, 4598 (2000) en_US
dc.description Author Institution: Laboratoire de Photophysique Moleculaire, Centre National de la Recherche Scientifique en_US
dc.description.abstract Hypobromous acid, HOBr, is an important species in atmospheric chemistry. In the stratosphere it is mainly produced by the reaction between BrO and $HO_{2}$ but rapidly photolyzed by sunlight. In the marine troposphere it is also formed by heterogeneous reactions on sea-salt aerosols and is thus involved in the transport of bromine from the oceans into the atmosphere. Attempts to measure atmospheric HOBr concentrations have been $made^{a}$ using its far-infrared rotational transitions. In order to provide accurate line positions and intensities in this region we have measured high-resolution Fourier-transform absorption spectra of gaseous HOBr between $100-350 cm^{-1}$ using the Bruker IFS-120 HR at LPPM in Orsay. We have been able to improve the rotational-vibrational parameters of the ground $states^{b}$ and of the $\nu_{3}$ bands of $HO^{79}Br$ and $HO^{81}Br$ around $620 cm^{-1}$. For the rotational line intensities we have taken into account the Herman-Wallis effects. Furthermore, we have measured high-resolution absorption spectra of the $2\nu_{1}$ bands around 1.4 $\mu$m and determined their rotational-vibrational parameters. These overtone bands are observed to be even stronger than the $\nu_{3}$ fundamental bands, in agreement with ab-initio $calculations^{c}$. The results might be useful for detection of atmospheric HOBr using Cavity Ring-Down Spectroscopy with telecommunication diode-lasers operating at room temperature. en_US
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dc.format.mimetype image/jpeg
dc.language.iso English en_US
dc.title HIGH-RESOLUTION SPECTROSCOPY OF HOBr IN THE FAR- AND NEAR-INFRARED en_US
dc.type article en_US