Numerical simulation of the coherent anti-Stokes Raman scattering spectrum of CO2

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Abstract
A CARS spectrum of natural CO2 under normal conditions of temperature and pressure has been recorded in the 1210–1480 cm−1 range with a resolution of 0.07 cm−1. We have observed the Q branches of the fundamental bands ν1 and 2ν2 of the different species of natural CO2 and several hot bands of the isotopic species 12C 16O2. We have also assigned the O and S lines, for all these bands, and some of the weak P and R lines of the first hot bands. A theoretical calculation of line positions and intensities has been performed taking into account Fermi resonance as well as l‐type doubling and Coriolis interaction. For the Q branches we have made a calculation with due account for motional narrowing. The entire spectrum has thus been simulated and the agreement with the experimental spectrum is excellent.

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