THE $\nu_{2}$ BANDS OF $BrNO_{2}$ (NITRYL BROMIDE) AROUND $787 CM^{-1}$
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Date
2002
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Publisher
Ohio State University
Abstract
Nitryl bromide, $BrNO_{2}$, is produced in the marine troposphere by heterogeneous reactions between nitrogen oxides and bromine containing $aerosols.^{a}$ Its peak concentrations reach values of several $10^{7} cm^{-3}.^{b}$ In polluted coastal areas, therefore, $BrNO_{2}$ is an important species in the release of bromine from the ocean into the $atmosphere.^{c}$ The $\nu_{2}$ fundamental bands of $^{79}BrNO_{2}$ and $^{81}BrNO_{2}$, located around $787 cm^{-1} (12.7 \mu m)$, were recorded using a high-resolution Fourier-transform infrared spectrometer. A total of nearly 5000 transitions with $J \leq 80$ and $K_{a} \leq 30$ were reproduced using a Watson-type A-reduced Hamiltonian with a root-mean-square deviation of better than $5 \times 10^{-4}cm^{-1}$. Rotational and centrifugal distortion constants for the $v_{2}$ states have been determined, as well as an improved set of ground state constants for both isotopomers. Due to their sharp Q branches falling into an atmospheric window, the $\nu_{2}$ bands might be useful for future attempts to detect atmospheric $BrNO_{2}$.
Description
$^{a}$W. Behnke, V. Sheer, and C. Zetzsch, J. Aerosol. Sci. 25, S277-S278, 1994. $^{b}$J. Moldanova and E. Ljungstr\""om, J. Geophys. Res. D106, 1271-1296, 2001. $^{c}$R. Vogt, P. J. Crutzen, and R. Sander, Nature 383, 327-330, 1996.
Author Institution: CNRS, Laboratoire de Photophysique Mol\'eculaire; Institut f\""{u}r Anorganische Chemie, Universit\""{a}t M\""{u}nster; Institut f\""{u}r Anorganische Chemie, Universit\""{a}t Duisburg; Centre de Physique Atomique Mol\'eculaire et Optique Quantique, Universit\'e de Douala; Centre de Physique Atomique Mol\'eculaire et Optique Quantique, Universit\'{e} de Ngaound\'{e}r\'{e}
Author Institution: CNRS, Laboratoire de Photophysique Mol\'eculaire; Institut f\""{u}r Anorganische Chemie, Universit\""{a}t M\""{u}nster; Institut f\""{u}r Anorganische Chemie, Universit\""{a}t Duisburg; Centre de Physique Atomique Mol\'eculaire et Optique Quantique, Universit\'e de Douala; Centre de Physique Atomique Mol\'eculaire et Optique Quantique, Universit\'{e} de Ngaound\'{e}r\'{e}