Microwave and submillimeter spectroscopy of Ar–NH3 states correlating with Ar+NH3 (j=1,‖k‖=1)

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Abstract
Microwave and submillimeter transitions for Ar–NH3 have been observed and assigned for the ∑ and Π states correlating asymptotically with Ar+NH3 (j=1,‖k‖=1). The ∑ states are found to lie below the Π states and are separated by approximately the inversion splitting of free NH3. For the Π states the NH3 inversion tunneling is nearly quenched, being only weakly allowed through Coriolis interactions with the nearby ∑ states. The observed microwave and submillimeter spectra also allow the determination of 14N quadrupole coupling constants and relative submillimeter absorption intensities. All the above results are interpreted using a model internal–rotation inversion Hamiltonian, leading to detailed information about the anisotropy of the intermolecular potential.