Knowledge Bank

Rotationally resolved (1+1') resonance-enhanced two-photon ionization spectra of the D and C $\leftarrow$ X,$0+$ band systems of several isotopomers of ArXe and KrXe were recorded using a narrow-bandwidth VUV laser system, \emph{Rev. Sci. Instr.} \textbf{71}, 4023 (2000).} at a resolution of 0.01 cm$-1$ in the wave number range from 77000 cm$-1$ to 77400 cm$-1$, \emph{J. Mol. Spectrosc.} \textbf{264}, 83 (2010).}. The analysis of the rotational structures enabled the characterization of the dissociation of the $\Omega$ = 1 states of ArXe and KrXe, \emph{J. Chem. Phys.} \textbf{108}, 5330 (1998).}. In the case of Rg$\mathrm{<mrow\; data-mjx-texclass="ORD">129</mrow>}$Xe and Rg$\mathrm{<mrow\; data-mjx-texclass="ORD">131</mrow>}$Xe (Rg=Ar, Kr), the hyperfine structure could also be resolved and provided new information on these states, and on the nature of the perturbations, \emph{J. Chem. Phys.} \textbf{96}, 2099 (1992).}$,$, \emph{J. Phys. B} \textbf{29}, L89 (1996).}. Model potentials for the perturbing and perturbed excited states were constructed in an attempt to rationalize the spectroscopic data. The spectra of the C and D states of ArXe and KrXe reveal strong perturbations$(c-e)$, and are subject to slow predissociation.