Experimental and Theoretical Investigations of Coherent Anti -Stokes Raman Scattering as a Nonintrusive Diagnostic for Gas -Phase Systems
Kuehner, Joel Paul
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https://hdl.handle.net/2142/83791
Description
Title
Experimental and Theoretical Investigations of Coherent Anti -Stokes Raman Scattering as a Nonintrusive Diagnostic for Gas -Phase Systems
Author(s)
Kuehner, Joel Paul
Issue Date
2003
Doctoral Committee Chair(s)
Dutton, J. Craig
Lucht, Robert P.
Department of Study
Mechanical Engineering
Discipline
Mechanical Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Chemistry, Physical
Language
eng
Abstract
The second portion of the work concerned the development of a theoretical model for electronic-resonance-enhanced CARS (ERE CARS) spectra of nitric oxide. This model incorporates the effects of the Raman resonance in conjunction with an electronic resonance to provide the first known theoretical predictions for NO. To determine the model's accuracy and effectiveness, predictions were compared to previously obtained experimental data. The comparisons displayed close agreement between spectral peak locations and relative intensities. Experimental linewidths were larger than predicted by the theory, which is attributed to saturation or Stark effects in the experiment. The model also allowed for the correct assignment of the molecular constants for the split ground states. This model can be used for investigations of NO formation in hypersonic flow and combustion and can be extended to other species for rapid detection of air pollutants and toxins.
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