Abstract
The J ′=3/2 (f)− J ″=1/2 (f) rotational transition of the open-shell van der Waals complex NO–HF has been observed using a Fourier transform microwave spectrometer. The transition shows a rich hyperfine structure due to coupling of the NO electronic spin and orbital angular momenta with the N nucleus and also with both the H and F nuclei in a novel intermolecular magnetic hyperfine interaction. The N hyperfine coupling reveals the splitting of the Π state degeneracy into A ′ and A ″ states, with the A ′ state lower in energy.
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