Abstract
The infrared vibration-rotation spectrum of PF5 in the 1025 cm−1 region is measured in a supersonic free jet. The spectrum in this region consists of the ν5 (E′) and 2ν8 (E′) bands which are strongly coupled by a Fermi interaction. The unperturbed molecular constants for both states and the interaction term are determined by including this interaction explicitly: ν0(ν5)=1025.7371(4) cm−1, ν0(2ν8)=1024.4483(4) cm−1, ζ5=0.603 36(15), ζ8=0.406 80(8), and W588=2.087 99(12) cm−1. The influence of a higher-order Coriolis interaction is identified as the origin of extraordinary A1A2 splittings in the K=1(+l) levels.
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