The Infrared Spectrum of 13C2D2: The Bending States up to v4+v5=2

Abstract The vibration–rotation spectrum of 13 C 2 D 2 has been recorded in the infrared region between 420 and 1100 cm −1 with an effective resolution ranging from 0.004 to 0.006 cm −1 , and in the millimeter-wave region between 68 and 518 GHz. A total of about 1400 rovibrational transitions (66 of which have been measured in the millimeter-wave region) have been assigned to 8 bands with 15 l -vibrational components involving the bending states up to v t = v 4 + v 5 =2. The ground state and nine vibrationally excited states have been characterized. All the measured transitions have been analyzed simultaneously by adopting a model Hamiltonian which takes into account the usual vibration and rotation l -type resonances, together with the Darling–Dennison coupling between the v 4 =2 and v 5 =2 bending states. The derived spectroscopic parameters reproduce the transition wavenumbers with a standard deviation of the fit of the order of the experimental uncertainty.

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