... try to detect the Ar-I₂ microwave (MW) spectrum to establish, once and for all, its ground state equilibrium configuration?
Some further details:
Previous experiments and calculations are still not completely certain in whether it is a linear (L) or a T-shaped complex (with zero vibrations included), while the pattern alone of MW lines could tell about this at once. The transition frequencies predicted theoretically [Ref. 30 of the Publication List] are in the range of 3-5 GHz for J= 2 to 4, which would seem to be accessible. Besides, if MW lines associated with both conformers were detected, the relative intensity of the L- and T-lines could describe quantitatively the relative stability of the two conformers.

... record the ArCl and ArO microwave spectra to reliably evaluate their ground state equilibrium distances?
Some further details:
There is a persistent discrepancy between the ArCl and ArO potentials calculated ab initio and empirical ones fitted to scattering and photoionisation spectroscopy data. Unusually, the theory predicts the potentials to be more attractive, particularly near the equilibrium distance for the ground state [Ref. 23]. This could be resolved with certainty by measuring the ArCl(X) and ArO(X) microwave spectra.