INELASTIC LASER SCATTERING BY $NO_{2}$ IN A NITROGEN ATOMOSPHERE

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1972

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Ohio State University

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We extend previous studies on the fluorescence of NO2 at low pressures1,2 and as a function of pressure3 to include the behavior of the inelastic scattering from NO2 in a nitrogen atmosphere as a function of incident photon energy. This paper reports the inelastic scattering cross sections and depolarization ratios of the two principal NO2 scattering peaks for each of four incident Argon laser lines. In addition, we will show the continuum scattering spectrum, corrected for instrumental quantum efficiency, for each of these laser pumps. The results indicate a departure from the ν4 scattering law by approximately a factor of five, over the narrow spectral range studied, for one of the scattering peaks. The scattering cross section of this peak is more than two orders of magnitude larger than the cross section for the Q-branch Raman scattering from N2.

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1 K. Sakurai and H. P. Broida, J. Chem. Phys. 50, 2404 (1969). 2 K.~ Abe, F. Myers, T. K. McCubbin and S. R. Polo, J. Mol. Spec. 38, 552, (1971). 3 C.M. Penny, M. Lapp and C. M. Goldman, presented at the Forth Conference on Laser Radar Studies of the Atmosphere, Tucson, January 26--28, 1972.""


Author Institution: National Oceanic and Atmospheric Administration Wave Propagation Laboratory

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