Knowledge Bank

Rotational spectra of various isotopomers of the NeArHCl trimer, including those with $H35Cl,H37Cl,D35Cl,D37Cl,20Ne$, and $\mathrm{<mrow\; data-mjx-texclass="ORD">22</mrow>}Ne$ were studied with a pulsed jet cavity Fourier transform microwave spectrometer. Both a- and b-type transitions could be measured in the frequency range from 3.8 to 17 GHz. Nuclear hyperfine structures due to $\mathrm{<mrow\; data-mjx-texclass="ORD">35</mrow>}Cl,37Cl$, and D were observed and analyzed. The resulting spectroscopic constants were used to derive effective structural parameters. The possibility to gain insight into non-additive contributions to the interaction energy through comparison with NcHCl, ArHCl, and $Ar2HCl$ is discussed.