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Published on: June 9, 2016
Resonant Raman-scattering measurements of trichloroethene in a thermal boundary layer
Yanda Zhang1, Peter B Kelly, Ian M Kennedy
1Department of Mechanical and Aeronautical Engineering, University of California-Davis, 95616, USA.
Abstract:
Concentration profiles of trichloroethene were measured in a boundary-layer flow over a heated ceramic surface. Raman scattering was excited with the fifth harmonic of a Nd:YAG laser at 213 nm. This wavelength took advantage of a resonance in the trichloroethene molecule to significantly enhance the C2HCl3 scattering cross section. The resonant Raman system was calibrated in a heated flow. The optical system was optimized so that measurements could be obtained close to the solid surface, normally a significant challenge for a spontaneous Raman-scattering setup. Measured concentrations indicated the lack of catalytic activity on a bare alumina surface. However, the results showed that a surface that was coated with Cr2O3-based zeolite was catalytically active.
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