Resumen de The ν1 and ν3 stretching fundamental bands of PD3
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).
