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    Perturbative theory and modeling of electronic-resonance-enhanced coherent anti-Stokes Raman scattering spectroscopy of nitric oxide

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    Date
    2008
    2008
    Author
    Kuehner, Joel P.
    Naik, Sameer V.
    Kulatilaka, Waruna D.
    Chai, Ning
    Laurendeau, Normand M.
    Lucht, Robert P.
    Scully, Marlan O.
    Roy, Sukesh
    Patnaik, Anil
    Gord, James R.
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    Description
    Joel P. Kuehner is a professor of Physics and Engineering at Washington and Lee University.
     
    Article; [FULL-TEXT AVAILABLE THROUGH LINK BELOW]
     
    A theory is developed for three-laser electronic-resonance-enhanced (ERE) coherent anti-Stokes Raman scattering (CARS) spectroscopy of nitric oxide (NO). A vibrational Q-branch Raman polarization is excited in the NO molecule by the frequency difference between visible Raman pump and Stokes beams. An ultraviolet probe beam is scattered from the induced Raman polarization to produce an ultraviolet ERE-CARS signal. The frequency of the ultraviolet probe beam is selected to be in electronic resonance with rotational transitions in the A2 + X2 (1, 0) band of NO. This choice results in a resonance between the frequency of the ERE-CARS signal and transitions in the (0, 0) band. The theoretical model for ERE-CARS NO spectra has been developed in the perturbative limit. Comparisons to experimental spectra are presented where either the probe laser was scanned with fixed Stokes frequency or the Stokes laser was scanned with fixed probe frequency. At atmospheric pressure and an NO concentration of 100 ppm, good agreement is found between theoretical and experimental spectral peak locations and relative intensities for both types of spectra. Factors relating to saturation in the experiments are discussed, including implications for the theoretical predictions. [Joel P. Kuehner is a professor of Physics and Engineering at Washington and Lee University.]
     
    URI
    http://hdl.handle.net/11021/16545
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