Abstract
The Fourier transform infrared (FTIR) spectrum of the ν6 band of ethylene-cis-d2(cis-C2H2D2) was recorded with a unapodized resolution of 0.0063cm−1 in the 990–1100cm−1 region. A total of 609 transitions were assigned to this band centred at 1039.7682±0.0003cm−1. The ν6 band was found to be coupled to the ν4 band by a-type Coriolis resonance. Both perturbed and unperturbed transitions were assigned and fitted to give eight rovibrational constants with high accuracy for the v6=1 state with a standard deviation of 0.00097cm−1 using a Watson’s A-reduced Hamiltonian in the Ir representation. From a rovibrational analysis of the Coriolis interaction between the ν6 band and non-infrared active ν4 band of cis-C2H2D2, the band centre of ν4 at 984.9±0.2cm−1 was derived. Furthermore, the second-order a-type Coriolis coupling constant between the two bands was obtained for the first time.
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