Knowledge Bank

Rotational spectra of $Ar-Ar-NH3$ and $Ne-Ne-NH3$ were measured between 4 and 23 GHz using a pulsed jet Fourier transform microwave spectrometer. Isotopomers containing $\mathrm{<mrow\; data-mjx-texclass="ORD">14</mrow>}NH3$ and $\mathrm{<mrow\; data-mjx-texclass="ORD">15</mrow>}NH3$ were studied in combination with Ar-Ar-,$\mathrm{<mrow\; data-mjx-texclass="ORD">20</mrow>}Ne-20Ne,22Ne-20Ne$ and $\mathrm{<mrow\; data-mjx-texclass="ORD">22</mrow>}Ne-22Ne$. For the $Ar-Ar-NH3$ complex the b-axis is the symmetry axis and only b-type transitions were observed. In contrast, the $\mathrm{<mrow\; data-mjx-texclass="ORD">20</mrow>}Ne-20Ne$ and $\mathrm{<mrow\; data-mjx-texclass="ORD">22</mrow>}Ne-22Ne-NH3$ allowed the observation of both a and b-type transistions. The spectra were fitted using an asymmetric rotor model and the resulting rotational constants were used to estimate the effective structures. Nuclear quadrupole hyperfine structure arising in terms of the intermolecular dynamics.