Michele Marrocco Effect of vibration–rotation coupling on simultaneous extraction of temperature and species concentration from vibrational CARS spectra of hot gases Journal of Raman Spectroscopy 44
The coupling between vibration and rotation in light molecules changes the strength of the coherent anti-Stokes Raman scattering in comparison to the conventional rigid-rotor approximation. The results show that small changes of the fitted temperature correspond to larger deviations for the determination of concentrations and non-resonant background. An example is the figure where the plot of the sum of squared differences indicates significant deviations for the physical parameters when the reference temperature is 2300 K.
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