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The long-wavelength, infrared-active fundamentals, ν4, have been observed for uranium, neptunium, and plutonium hexafluorides at 186.2, 198.6, and 206.0 cm−1, respectively. The corresponding values predicted earlier from combination bands were 184, 198, and 203 cm−1. From the P—R branch separations Coriolis zeta constants have been calculated for these bands.
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Frlec et al. (1967) studied this question.
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