E. Canè, L. Fusina, W. Jerzembeck, H. Bürger
The infrared (IR) spectrum of PD3 has been recorded in the 1580–1800 cm−1 range at a resolution of 0.0027 cm−1. About 2400 rovibrational transitions with J′=K′⩽22 have been measured and assigned to the ν1 (A1) and ν3 (E) stretching fundamentals. These include 506 “perturbation-allowed” transitions with selection rules Δ(k−l)=±3. Splittings of the K′′=3 lines have been observed. Effects of strong perturbations are evident in the spectrum. Therefore the rovibrational Hamiltonian adopted for the analysis explicitly takes into account the Coriolis and k-type interactions between the v1=1 and v3=1 states, and includes also several essential resonances within these states. The rotational structure in the v1=1 and v3=1 vibrational states up to J′=K′=18 was reproduced by fitting simultaneously all experimental data. Thirty-four parameters reproduced 1950 transitions retained in the final cycle with a standard deviation of the fit equal to 4.9 × 10−4 cm−1 (about the precision of the experimental measurements).
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