Abstract
The high resolution Fourier transform infrared (FTIR) absorption spectrum of the ν2+ν12 band of cis-C2H2D2 was recorded in the frequency range of 2515–2960cm−1 with an unapodized resolution of 0.0063cm−1. This band was perturbed through c-type Coriolis interaction by the unobserved ν2+2ν10 band approximately 19cm−1 below ν2+ν12. A total of 751 unperturbed and perturbed infrared transitions of ν2+ν12 were assigned and fitted using Watson’s A-reduced Hamiltonian in the Ir representation with the inclusion of c-type Coriolis terms to give 11 rovibrational constants for the upper state (ν2=1, ν12=1) with improved accuracy. The ν2+ν12A-type band is centred at 2898.8975±0.0004cm−1. From the Coriolis interaction analysis between the ν2+ν12 and ν2+2ν10 bands of cis-C2H2D2, a higher order K-dependent c-type Coriolis coupling constant between the two bands was derived for the first time. Furthermore, rotational constants for the ν2+2ν10 band of cis-C2H2D2 centred at 2880.17±0.06cm−1 were also determined.
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