Intense hot Raman transitions within Renner-Teller states

We analyze the hot Raman transitions within the split components of the first excited vibrational level of a Renner-Teller active mode in linear molecules. These transitions are predicted to be almost as intense as Rayleigh transitions and we expect them to be among the most prominent features of the Raman spectra. We describe the spectroscopic pattern, excitation profile, and depolarization ratio of Raman transitions within 2Π Renner-Teller active states via ²Σ, ²Π, and ²Δ intermediate electronic states. We discuss these Raman transitions for the Renner-Teller case in the absence and presence of spin-orbit coupling.