Determination of the structure of ArHF

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Abstract
Radio‐frequency and microwave spectra of K = 0 states of ArHF in the ground vibrational state have been measured by molecular beam electric resonance spectroscopy. The rotational constant is (B+C)/2=3065.719 MHz; the component of the dipole moment along the a inertial axis is μa = 1.332 D. From the centrifugal distortion constant, DJ = 72.1 kHz, the stretching frequency of the van der Waals bond is estimated to be 42.1 cm−1. In analogy with ArHCl the internal Ar–F–H angle θ is expected to be acute and the average value of the angle is 48.20°. The equilibrium configuration is likely to be near linear with atomic arrangement ArHF. The vibrationally averaged Ar–F distance is 3.540 Å.