The free jet millimeter wave spectrum of 1,3-dioxolane-argon has been
investigated in the 60-78 GHz frequency range. The argon atom is locat
ed over the center of mass of the monomer, roughly perpendicular to th
e 1,3-dioxolane ring. Very high values of quartic centrifugal distorti
on constants, compared to those of similar adducts, suggest a relative
ly weak linkage of Ar to the ring. (C) 1997 Academic Press.