Abstract
The resonance crossing of rotational levels with different fine-structure components and different k rotational quantum numbers was observed in the rotational spectra of the symmetric top fluorosulfate radical FSO3. Detailed measurements were performed to analyze these weak resonances as well as the A1–A2 splittings of the K = 3 and K = 6 transitions. The resonance level crossing enabled the experimental determination of “forbidden” parameters, the rotational A and the centrifugal distortion DK constants as well as the corresponding resonance off-diagonal matrix element.
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