THE SEARCH FOR PROTONATED WATER CLUSTERS: THZ LASER SPECTRUM OF A PULSED SUPERSONIC SLIT DISCHARGE: $D_{2}O^{+}, D_{3}O^{+}$, OD
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Date
1999
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Publisher
Ohio State University
Abstract
Protonated water clusters have been the focus of theoretical interest for two decades, but few results on their spectra have been reported so $far^{a}$. Research on neutral water clusters in the last few years has shown that a pulsed supersonic slit expansion source allows observation of spectra up to the $hexamer^{b}$. Because of the stronger ion-dipole interaction and the expected higher binding energy of protonated water clusters (30 kcal/mol H2O), these might also be observable by using a pulsed slit source with a high current (high ionization degree) $discharge^{c}$. We present very dense THz laser absorption spectra obtained with a $NeHe/D_{2}O$-operated discharge expansion in the range of 1000-2500 GHz $(30-75 cm^{-1})$, using an advanced pulsed discharge slit source. We present assignments of lines of the species OD, $D_{2}O^{+}$ and $D_{3}O^{+}$ and their hot band rotational lines, and discuss progress in assigning the many unassigned features.
Description
$^{a}$L. I. Yeh, Y.T. Lee, J.T. Hougen $^{b}$K. Liu, M.G. Brown, R.J. Saykally, J. Phys. Chem. A, 1997, 101, 8995; K. Liu, M.G. Brown, J.D. Cruzan, R.J. Saykally, J. Phys. Chem. A. 1997, 101, 9011; J.D. Cruzan, M.R. Viant, M.G. Brown, R.J. Saykally, J. Phys. Chem. A, 1997, 101, 9022; M.R. Viant, J.D. Cruzan, D.D. Lucas, M.G. Brown, and others. J. Phys. Chem. A, 1997, 101, 9032. $^{c}$D.T. Anderson, S. Davis, T.S. Zwier, D.J. Nesbitt
Author Institution: Department of Chemistry, University of California Berkeley, Berkeley, CA; Physical and Theoretical Chemical Laboratory, South Parks Road, Oxford, UK
Author Institution: Department of Chemistry, University of California Berkeley, Berkeley, CA; Physical and Theoretical Chemical Laboratory, South Parks Road, Oxford, UK