# OBSERVATION OF A NEW VIBRATIONAL MODE OF $(D_{2}O)_{2}$ NEAR $68 cm^{-1}$ USING TUNABLE FAR-INFRARED LASER SPECTROSCOPY

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 Title: OBSERVATION OF A NEW VIBRATIONAL MODE OF $(D_{2}O)_{2}$ NEAR $68 cm^{-1}$ USING TUNABLE FAR-INFRARED LASER SPECTROSCOPY Creators: Cruzan, J. D.; Loeser, J. G.; Bitten, E.; Braly, L. B.; Saykally, R. J. Issue Date: 1995 Publisher: Ohio State University Abstract: We have measured the far-infrared vibration-rotation-tunneling (VRT) spectrum of an intermolecular vibration of $(D_{2}O)_{2}$ near $68 cm^{-1}$. In addition, further transitions of the VRT band of $(D_{2}O)_{2}$ previously reported by $Pugliano et al^{1}$ have been observed. By considering symmetry restraints on the selection rules, these bands have been assigned to the out-of-plane H-bond torsional and in-plane acceptor waggins modes predicted by many theoretical $calculations^{2}.$ The experimental-theoretical discrepancy in the measured frequencies of these bands indicates the importance of a fully coupled six-dimmensional calculation of the dynamics for the water dimer. Description: 1. N.P. Pugliano, J.D. Cruzan, J.G. Loeser and R.J. Saykally, J. Chem. Phys., 98, 6600 (1992). 2. For example S.C. Althorpe and D.C. Clary, J. Chem. Phys., 101, 3603 (1994). Author Institution: University of California at Berkeley, Berkeley, CA 94720 URI: http://hdl.handle.net/1811/29883 Other Identifiers: 1995-TL-07