THE SUBMILLIMETER ROTATION-TUNNELING SPECTRUM OF AR-D2O AND AR-NH3

Two bands for Ar-D2O and one band for Ar-NH3 have been observed for the first time in the frequency region 300-500 GHz. For both complexes the bands are explained in terms of a nearly free internal rotor model, following earlier investigations of these types of complexes. We found evidence that this model is correct for Ar-D2O. Two of the internal rotor states studied for the Ar-D2O complex show a Coriolis interaction and the interaction constant is determined. The hyperfine constants for the studied excited state of the Ar-NH3 complex turn out to be large.