Fig. 4

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Perturbation shifts in selected aR-branch rotational transitions in the ground-state tunnelling doublet. The plotted quantity is the scaled difference between frequencies from the full spectroscopic model (ν) and perturbation-removed frequencies (ν0) calculated without the interstate coupling terms. The matching character of the observed resonance behaviour identifies the interacting Ka sequences in the two substates. Circles denote experimental measurements, and the perturbation contribution at the resonance peak at J″ + 1 = 30 is near 2.4 GHz. The 0+ sequence hasa smaller resonance at J″ + 1 = 19, which we identify as resulting from a resonance with a different, Ka = 2 sequence in substate 0-. All measured transitions involved in the resonances are fitted to within their experimental uncertainty.
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