Broad-band CARS spectrum

This band was selected rather than the stronger (0,0) band since the Stokes laser is then positioned in the spectral region covered by the dye DCM which has a very broad tuning range necessary to cover the simple, but quite spectrally-separated electronically-resonant CARS spectrum. Electronic resonance enhancement has been observed in OH in flames as seen in Fig. 11. Without enhancement, OH, even at the percent concentrations possible in very high temperature flames, would be submerged within the H2O CARS spectrum whose modulated bandhead is seen near 3652... 

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