Abstract
The ν 3 band of MoF6 is studied at a low rotational and vibrational temperature using a tunable diode laser. More than 500 vibration-rotation lines are measured in the range of 740 to 752cm−1 with a Doppler-limited resolution. The observed spectrum is strongly perturbed by the 2ν 5+ν 6 combination state located at 743·3 cm−1. From less perturbed portion of the spectrum, four spectroscopic constants, ν 3, B 3, Bζ 3, and α 224, are determined for all of the seven Mo isotopic species. Energy level structure of the perturbing state is calculated with molecular parameters transferred from the cubic potential constants of SF6. The observed isotopic and J dependence of the perturbation is found to be consistent with Fermi interactions between the ν 3 and the 2ν 5+ν 6 state.
Published Version
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