ROTATIONAL SPECTRA AND STRUCTURES OF $Ar_{2}-H_{2}O, Ar_{3}-H_{2}O$, AND $Ar-(H_{2}O)_{3}$.
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Date
1994
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Ohio State University
Abstract
The $Ar/H_{2}O$ system is being studied with a Balle/Flygare, pulsed-beam Fourier transform microwave spectrometer. Threee new beteroclusters have been identified; a T-shaped $C_{2v} Ar-H_{2}O$, a symmetric top $Ar_{3}-H_{2}O$ and a symmetric top $Ar (H_{2}O)_{3}$. The $Ar_{m}-H_{2}O$ species are very similar to $Ar^{2}$ HX and $Ar_{3}-HX$(X-F, Cl), with the main differences attributable to the $C_{2v}$ shape of $H_{2}O$ versus the linear HX. thereby the transitions of $Ar_{2}-H_{2}O$ are split $\sim$ 90 MHz by tunnelliing interchange of the protons while the transitions of $Ar_{3}-H_{2}O$ may exhibit both m=0 and m=1 internal rotor states. The spectrum of $Ar-(H_{2}O)_{3}$ is dominated by the complexities in it of the free cyclic water trimer found by $Saykally^{1,2}$ and may help clarify the tunnelling within the trimer. In addition we have observed a number of transitions which are likely to be those of the $Ar (H_{2}O)_{2}$ trimer(S).
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1. N. Pugliano and R. J. Saykally, Science 257, 1937 (1992). 2. K. Liu et al., J. Am. Chem. Soc., in press. We thank the authors for a preprint prior to publication.
Author Institution: Department of Chemistry, , University of Illinois,
Author Institution: Department of Chemistry, , University of Illinois,