Knowledge Bank

The upper component of the ground state perpendicular tunneling-rotation spectrum of the $Ar-H2O$ dimer has been observed near $21cm-1$ using a cw planar supersonic jet and a tunable far infrared laser system. Analysis of this sub-band suggest an A rotational constant less than $17cm-1$ and a tunneling splitting of $2-11cm-1$. Observation of one sub-band of the out-of-plane bending vibration, $(1Ka-0\to 0Ka=1)$ near $24cm-1$ goves a bending vibration near $40cm-1$. The data is used to suggest the structure of the intermolecular potential energy surface.