dc.creator Keutsch, F. N. en_US dc.creator Fellers, R. S. en_US dc.creator Petersen, P. B. en_US dc.creator Viant, Mark R. en_US dc.creator Brown, M. G. en_US dc.creator Saykally, R. J. en_US dc.date.accessioned 2006-06-15T19:55:42Z dc.date.available 2006-06-15T19:55:42Z dc.date.issued 2000 en_US dc.identifier 2000-MF-07 en_US dc.identifier.uri http://hdl.handle.net/1811/19666 dc.description $^{a}$W. Klopper, M. Schutz, H. P. Luthi, S. Leutwyler, J. Chem. Phys. 103, 1085 (1995). $^{b}$A. Luzar, D. Chandler, Nature 379, 55(1996). en_US dc.description Author Institution: Department of Chemistry, University of California Berkeley en_US dc.description.abstract We report the observation of a new vibration-rotation-tunneling (VRT) band of $(D_{2}O)_{3}$ at $142.8 cm^{-1}$ and a set of four bands of $(H_{2}O)_{3}$ around $520 cm^{-1}$. These new bands represent the first observation of a translational and librational vibration for a water cluster. The observed VRT spectrum of $(D_{2}O)_{3}$ at $142.8 cm^{-1}$, in the translational band of the liquid, is assigned to a combination band or mixed level of the asymmetric hydrogen bond stretch and a torsional vibration. The predicted frequencies of the hydrogen bond stretching modes are too high, presumably because calculations fail to include the necessary coupling between stretching and torsional $motions^{a}$. The bands of $(H_{2}O)_{3}$ around $520 cm^{-1}$ lie in the librational band region of liquid water and are tentatively assigned to the our of plane librational vibration. The observation of at least four bands within $8 cm^{-1}$ is explained by a dramatically increased splitting of the excited state rovibrational levels by bifurcation-tunneling. The experimental results presented should therefore allow for the first exact determination of the height of the bifurcation tunneling barrier. The tunneling time scale is estimated at 2-4ps, similar to those of several important dynamical processes in bulk $water^{b}$. en_US dc.format.extent 140914 bytes dc.format.mimetype image/jpeg dc.language.iso English en_US dc.publisher Ohio State University en_US dc.title VRT-SPECTROSCOPY IN THE TRANSLATIONAL AND LIBRATIONAL BAND REGION OF LIQUID WATER: HYDROGEN BOND TUNNELING DYNAMICS IN WATER CLUSTERS en_US dc.type article en_US
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