Ring puckering combinations with the totally symmetric ring stretching vibration in some deuterated analogs of trimethylene oxide as resolved by cars

Abstract The complex Raman lines of the totally symmetric ring breathing modes of α-d 2 , β-d 2 and trimethylene oxide are resolved by Coherent Antistokes Raman Scattering (CARS) into sequences of combination transitions with the ring puckering vibration. Specific assignment of the sequence is possible for the β-d 2 compound with the help of corresponding infrared sum bands. The implications for the effective puckering potential function in the excited state of the second mode, and the suitability of the CARS methods for problems of this kind is discussed.