# FAR INFRARED VIBRATION-ROTATION-TUNNELING SPECTROSCOPY AND THE INTERMOLECULAR POTENTIAL ENERGY SURFACE OF $Ar-NH_{3}$

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 Title: FAR INFRARED VIBRATION-ROTATION-TUNNELING SPECTROSCOPY AND THE INTERMOLECULAR POTENTIAL ENERGY SURFACE OF $Ar-NH_{3}$ Creators: Schmuttenmaer, C. A.; Cohen, R. C.; Saykally, R. J. Issue Date: 1990 Publisher: Ohio State University Abstract: Two new far infrared bands of $Ar-NH_{3}$ have been measured that share a common lower state with the band previously measured in our $lab^{1}$. These three bands have all been assigned as transitions originating from the ground $state^{2}$. One has been assigned as the first van der Waals stretching transition. The other two have been assigned as transitions to the levels resulting from the splitting of the js-1, k-0 rotational state of free $NH{3}$ due to the anisotropic potential, as suggested by B.J. $Howard^{3}$. An analysis using a least squares fit to an analytical form for the intermolecular potential has been carried out. Description: $^{1}$ D.H. Cwo, M.L. Havenith, R.C. Cohen, K.L. Busarow, Y.T. Lee. R.J. Saykal/, Submitted for publication. $^{2}$ D.D. Nelson. Jr.. G.T. Fraser, K.I. Peterson, K. Zhao, W. Klemperer. P.J. Lovas., R.D. Suenram, J. Chem. Phys. 85, 5512 (1986). $^{3}$ J. Howard, Private communication. Author Institution: Department of Chemistry, University of California, and Materials and Chemical Sciences Division URI: http://hdl.handle.net/1811/18246 Other Identifiers: 1990-TA-6