Knowledge Bank

Rotational spectra of the $Kr-H2O$ van der Waals complex were measured between 4 and 19 GHz using a pulsed jet cavity Fourier transform microwave spectrometer. The isotopomers studied include those of $H2O,HDO,D2O,H217O$, and $H218O$ with 6 different isotopes of Kr. Tunnelling splittings were observed for all isotopomers with the exception of Kr-HDO. Transitions of complexes with $\mathrm{<mrow\; data-mjx-texclass="ORD">83</mrow>}Kr,D2O,HDO,andH217O$ showed nuclear hyperfine structure due to the quadrupole moments of $\mathrm{<mrow\; data-mjx-texclass="ORD">83</mrow>}Kr,D$, and $\mathrm{<mrow\; data-mjx-texclass="ORD">17</mrow>}O$, respectively. Rotational and centrifugal distortion constants were determined and used to calculate structural parameters.