# FAR INFRARED VIBRATION-ROTATION-TUNNELING SPECTROSCOPY AND TUNNELING DYNAMICS OF $CH_{4}-H_{2}O$

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 Title: FAR INFRARED VIBRATION-ROTATION-TUNNELING SPECTROSCOPY AND TUNNELING DYNAMICS OF $CH_{4}-H_{2}O$ Creators: Busarow, K. L.; Cohen, R. C.; Schmuttenmaer, C. A.; Lee, Y. T.; Saykally, R. J. Issue Date: 1990 Publisher: Ohio State University Abstract: There has been a great deal of investigation into better understanding hydrophobic interactions in liquid phase systems. However, progress in understanding the most fundamental solute-solvent interactions has been impeded by the lack of accurate potential energy surfaces for these systems. In this talk, we present the far infrared spectrum of $CH_{4}-H_{2}O$, as well as a proposed energy level scheme for this dimer. The experimental apparatus is a tunable far infrared laser spectrometer combined with a planar supersonic jet expansion. Over 200 lines have been observed, of which 110 lines have been assigned to nine different vibration-rotation bands at $-19 cm^{-1,}$ all of which, we propose are associated with the $\sigma(1_{01})-\Pi(1_{10})$ transition in the water $subunit^{1}$. Exact vibrational assignments have yet to be determined. In addition, preliminary results indicate that the $CH_{4}-H_{2}O$ is considerably more strongly bound than $Ar-H_{2}O$ (D.E. $\Sigma(1_{01})---137 cm ^{-1 2}$) Description: $^{1}$ R.C. Cohen, K.L. Busarow, Y.T. Lee, and K.J. Saykally, J. Chem. Phys. 92. 169 (1990). $^{2}$ R.C. Cohen and R.J. Saykally, manuscript in preparation. Author Institution: Department of Chemistry, University of California and Materials and Chemical Sciences Division, Lawrence Berkeley Laboratory URI: http://hdl.handle.net/1811/18238 Other Identifiers: 1990-TA-10