TEMPERATURE DEPENDENCE OF $N_{2}$-BROADENING COEFFICIENTS IN THE $v_{3}$ BAND OF OZONE

$^{1}$R. Gamache, J. Mol. Spectrose. 114, 31 (1985).""Author Institution: NASA AMES Research Center; NASA AMES Research CenterWe report the first measurements of the temperature dependence of the nitrogen broadening coefficients of selected ozone rovibrational transitions. We recorded spectra of the $v_{3}$ band at approximately 1000 $cm^{-1}$ with a Bomem Fourier transform spectrometer at a resolution of $0.004 cm^{-1}$ and broadened by nitrogen at pressures ranging from 0 to 80 torr. The temperature was varied over the range of 180 K to 296 K in 20 K increments from one set of broadend spectra to the next. The pressure broadening coefficient, $\gamma$(T), for a particular transition at a temperature, T, was obtained as the slope of a straight line plot of the collision broadened half-width vs. added nitrogen pressure. The dependence of the pressure broadening coefficient was assumed to be given by the power law, $\gamma(T)/\gamma(T_{0}) = (T/T_{0})^{-n},$ where $T_{0}$ is a reference temperature (296 K) and n is the temperature exponent. A plot of In $(\gamma (T))$ vs. In(296 K/T) therefore yields n. Values of n have been obtained for approximately 30 transitions in the $v_{3}$ band and are close to the theoretically predicted average value of 0.76. We compare our experimentally determined temperature coefficients to those predicted by Quantum Fourier Transform $theory^{1}$