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 C<sub>2</sub>HCl<sub>3</sub> 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 Cr<sub>2</sub>O<sub>3</sub>-based zeolite was catalytically active.
© 2002 Optical Society of America
(120.1740) Instrumentation, measurement, and metrology : Combustion diagnostics
(120.6200) Instrumentation, measurement, and metrology : Spectrometers and spectroscopic instrumentation
(300.6450) Spectroscopy : Spectroscopy, Raman
Yanda Zhang, Peter B. Kelly, and Ian M. Kennedy, "Resonant Raman-Scattering Measurements of Trichloroethene in a Thermal Boundary Layer," Appl. Opt. 41, 2962-2972 (2002)