Knowledge Bank

We $reported1,2$ the high resolution electronic spectra of the $Ne\cdot OH/DA¯-X¯$ transitions, terminating in the $A¯(0,10,1),(0.10,1)$ and $(0.10.1)$ levels, with detailed analyses including rotational. fine, and hyperfine structure. The notation $(vOH,nx,v1)$ indicate respectively the quantum numbers of the OH moiety stretch, the OH internal rotation with the projection K superscripted, and the van der Waals stretch. The previous analyses reveal that the parity splitting for the $X¯$ state of $Ar\cdot OH/D$ is indeterminate with our resolution, but the parity splitting in the $X¯$ state of $Ne\cdot OH/D$ is well determined with a magnitude approximately 10 times larger than the reported $value3$ in $Ar\cdot OH/D$. In addition, we also observed a large spin-rotation parameter $\gamma$ in the $A¯(0,10,1)$ level of $Ne\cdot OH$ (as well as $Ne\cdot OD)$. The value of $\gamma$ is 180(6) MHz for $Ne\cdot OH$, and is approximately 3 times larger than the corresponding parameters in the other $A¯$ state vibrational levels of $Ne\cdot OH[\gamma =65(19)MHz]$ and $Ar\cdot OH[\gamma =46(12)MHz]$. We have additionally obtained the spectrum of $Ne\cdot OH$ terminating in the $A¯$ $(0,11,1)$ level, which also possesses a large $\gamma$ value of 160(24) MHz. A model based upon perturbation theory for open-shell complexes at the free rotor limit is proposed and successfully explains the spin-rotation interaction. Moreover, a parity splitting in the $A¯(0.11,1)$ level of $Ne\cdot OH$ has also determined. The details of analyses will be presented.