Raman excitation profile of nitrobenzene: prospect of Raman lidar detection

Sheikh Rafi Ahmad; V. G. Foster

doi:10.1117/12.258145

12 November 1996 Raman excitation profile of nitrobenzene: prospect of Raman lidar detection

Sheikh Rafi Ahmad, V. G. Foster

Proceedings Volume 2833, Application of Lidar to Current Atmospheric Topics; (1996) https://doi.org/10.1117/12.258145
Event: SPIE's 1996 International Symposium on Optical Science, Engineering, and Instrumentation, 1996, Denver, CO, United States

Abstract

The absolute values of the Raman scattering cross-section of the 1347 cm^-1 NO₂ symmetric stretch mode of nitrobenzene vapor were measured at some discrete excitation wavelengths in the range 240 nm to 420 nm. An analytical expression for their wavelength dependence was obtained from the numerical `best fit' of the data to Albrecht `A' term. The Raman excitation profile, thus created, exhibits a strong resonance effect, attributed to the charge-transfer state in C₆H₅NO₂ corresponding to the absorption peak at 240 nm. At near resonance excitation (250 nm) the Raman cross-section was found to be more than two orders of magnitude higher than that expected at the same wavelength from (lambda) ^-4 dependence. Although the excitation profile remained the same, the vapor phase cross-section values were almost an order of magnitude lower than those measured in liquid phase. The implication of resonance enhancement on the Raman lidar detection of NB vapor was analyzed for a standard atmospheric model with different ozone loadings using LOWTRAN7 computer code.

Citation Download Citation

Sheikh Rafi Ahmad and V. G. Foster "Raman excitation profile of nitrobenzene: prospect of Raman lidar detection", Proc. SPIE 2833, Application of Lidar to Current Atmospheric Topics, (12 November 1996); https://doi.org/10.1117/12.258145

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