# THE MICROWAVE SPECTRUM OF THE WATER-$PF_{3}$ AND $NEON-PF_{3}$ DIMERS

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 Title: THE MICROWAVE SPECTRUM OF THE WATER-$PF_{3}$ AND $NEON-PF_{3}$ DIMERS Creators: Hillig, K. W., II; Labarge, M. S.; Kuczkowski, R. L. Issue Date: 1989 Publisher: Ohio State University Abstract: Studies of the $PF_{3}$-Ar system resulted in some six transitions which could not be assigned to that species. Since they appeared with either Ar and Ne carrier gases they were suspected to be a $PF_{3}$ dimer and this possibility was mentioned at previous conferences. We have discovered that the transitions are considerably enhanced when water is added to the raregas-$PF_{3}$ mixture. Twelve transitions have now been assigned and the rotational constants are plausible for a $PF_{3}$-water dimer separated by $3.24 {\AA} (R_{cm})$. The transitions appear as unequal doublets presumably split by tunneling of the water. The dipole moment of the complex is 2.28 D. This suggests that the water and $PF_{3}$ dipoles make an angle of about $110^{\circ}$ in the complex (assuming no polarization of either species). A symmetric top spectrum was also found in the $PF_{3}-Ne-H_{2}O$ system. Moments of inertia and mixing experiments indicate that this is the $PF_{3}-Ne$ complex. $R_{cm}$ for this dimer is 3.38 {\AA}. Unlike $PF_{3}$-Ar and $PF_{3}$-Kr in which the rare-gas atom lies over a $PF_{2}$ face, the neon atom lies on the $PF_{3}$ symmetry axis. A simple van der Waals radius hard sphere model puts the neon atom over the $F_{3}$ face. The dipole moment of the complex is about 1.0 D, similar to free $PF_{3}$. Description: Author Institution: Department of Chemistry, University of Michigan URI: http://hdl.handle.net/1811/17764 Other Identifiers: 1989-FB-10