Abstract
Fourier transform and grating IR spectrometers and tunable diode lasers have been used to record the IR spectrum of TeF 6. The isotopic structure in the stretching fundamental ν 3is resolved, revealing a tellurium isotope shift of approximately 0.68 cm −1 amu −1. Some of the rotational structure in the P and R branches of ν 3 of 99.3% 130TeF 6 is also resolved and analyzed to yield a Coriolis constant ζ 3 = 0.225. Integrated absorptivities are reported for ν 3 and for the stronger combination bands. The isotope shifts and Coriolis constants are used to fix the general quadratic symmetry and valence force fields, and the force constants of the Group VI series SF 6, SeF 6, and TeF 6 are compared and discussed.
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