Line coupling effects in anisotropic Raman Q branches of the ν1/2ν2 Fermi dyad in CO2

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Abstract
The generalized energy corrected sudden model is used to calculate the Q branch of the anisotropic coherent anti‐Stokes Raman scatteringspectra corresponding to the ν1 and 2ν2 transitions of the Fermi dyad of CO2. The corresponding experimental spectra have been recorded for pressures leading to a consistent overlapping between the rotational components. This leads to a new experimental evaluation of the relaxation time of the second‐order tensor associated with the rotational angular momentum. The value is in excellent agreement with that already obtained from the study of the infrared absorption Q branch, the Rayleigh scattering, and the viscomagnetic effect.