# POTENTIAL FUNCTION FOR THE $\nu_{7}$ VIBRATION OF PHOSPHORUS PENTAFLUORIDE

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 Title: POTENTIAL FUNCTION FOR THE $\nu_{7}$ VIBRATION OF PHOSPHORUS PENTAFLUORIDE Creators: Bernstein, Lawrence S.; Kim, Janice J.; Pitzer, K. S.; Abramowitz, Stanley; Levin, Ira W. Issue Date: 1975 Publisher: Ohio State University Abstract: The gas phase Raman spectrum of the $\nu_{7}$ fundamental of $PF_{5}$ has been observed under spectral resolutions approaching 1 $cm^{-1}$. With the use of a two dimensional harmonic oscillator basis set and a potential function of the form $V(p, \varphi) = 1/2ap^{2} - b \cos(3\varphi)p^{3} + cp^{4}$, an adequate fit to the observed spectrum was obtained. In addition, this potential enabled us to estimate an axial-equatorial fluorine interchange barrier of 1371 $cm^{-1}$ (3.92 Kcal/mole). As one might expect, the other $MF_{5}$ ($D_{3{h}}$) gas phase molecules such as $AsF_{5}$ and $VF_{5}$ should show a $\nu_{7}$ spectrum very similar to that of $PF_{5}$. We are currently studying $AsF_{5}$ and $VF_{5}$ and find this to be the case. Description: Author Institution: Bell Laboratories, Murray Hill; Inorganic Materials Research Division Lawrence Berkeley Laboratory and Chemistry Department, University of California; Inorganic Materials Research Division Lawrence Berkeley Laboratory and Chemistry Department, National Bureau of Standards; Laboratory of Chemical Physics, National Institute of Arthritis Metabolism and Digestive Diseases URI: http://hdl.handle.net/1811/9429 Other Identifiers: 1975-TA-06