Abstract
The spectrum of the ν7+ν8 band of ethylene-cis-d2 (cis-C2H2D2) was recorded with a unapodized resolution of 0.0063cm−1 in the 1525–1675cm−1 region using a Fourier transform infrared (FTIR) spectrometer. Assignments of 536 transitions were made for this band centred at 1599.42009±0.00038cm−1. The ν7+ν8 band was found to be perturbed by the ν2 band through a c-type Coriolis resonance. Both perturbed and unperturbed transitions were fitted to give 12 rovibrational constants with high accuracy for the ν7+ν8=1 state with a standard deviation of 0.00099cm−1 using a Watson’s A-reduced Hamiltonian in the Ir representation. From an analysis of the Coriolis interaction between the ν7+ν8 band and the ν2 band of cis-C2H2D2, the band centre of ν2 at 1572.795±0.025cm−1 was derived. Furthermore, the first-order c-type Coriolis coupling constant between the two bands was accurately obtained.
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