Knowledge Bank

The rotational, fine, and hyperfine structure in the high resolution electronic spectra of the $Ar\cdot OH/DA¯\leftarrow X¯$ bands has been well studied and $reported.1.2$ A comparison between these results and our recent analyses on the spectra of $Ne\cdot OH/D$ reveals even more interesting information about the nature of these open-shell complexes. It is found that there are similarities and differences in the spectra of $Ne\cdot OH/D$ and $Ar\cdot OH/D$. Both Ar and Ne complexes have bands which can be characterized by transitions from the ground vibrational level in the $X¯$ state to the $A¯$ state levels either with or without a quantum in torsional (bending) mode. The bands of both Ar and Ne complexes, involving no quanta in the $A¯$ state bending mode, show similar rotation, fine, and hyperfine structure. On the other hand, those bands involving bend excitation in the $A¯$ state of $Ne\cdot OH/D$ show quite distinct differences to those of $Ar\cdot OH/D$. We have completed analyses on all observed spectra or Ar and Ne complexes. A detailed comparison on rotational, fine, and hyperfine structure as well as their physical interpretations will be discussed.