Knowledge Bank

The microwave spectrum of chlorine dioxide has already been assigned and a crude hyperfine structure analysis $given.1$ The approximate interaction parameters $obtained1$ have been found to be indeed approximately correct, but have been refined. The hyperfine structure can now be fitted nearly to experimental error. Hyperfine structure matrix elements off-diagnoal in the rotational quantum numbers have been found to give a small but significant effect through second order perturbation. Some discussion of the interpretation of the hyperfine interaction constants will be given. The rotational assignment and geometrical structure previously $given1$ have been completely confirmed by the spectrum of $Cl35O16O18$. Isotope effects on the hyperfine constants will be discussed.