HIGH-RESOLUTION ROTATIONAL SPECTROSCOPY OF NITROUS OXIDE SOLVATED BY HYDROGEN MOLECULES
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Date
2008
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Ohio State University
Abstract
A linear molecule nitrous oxide (N$_{2}$O) was systematically solvated by hydrogen molecules (both $ortho$-H$_{2}$ and $para$-H$_{2}$ spin isomers) and investigated using high-resolution microwave spectroscopy. Clusters containing combinations of spin isomers, i.e. ($ortho$H$_{2}$)$_{N}$-N$_{2}$O, ($ortho$-H$_{2}$)$_{N-M}$($para$-H$_{2}$)$_{N}$-N$_{2}$O and ($para$-H$_{2}$)$_{N}$-N$_{2}$O, were measured using a pulsed molecular beam, Balle-Flygare type Fourier transform microwave spectrometer. The assignment of $N$, the number of solvating hydrogen molecules, is supported by the pressure and concentration dependencies of the line intensities and by the previous infrared work by Tang and McKellar [J. Chem. Phys. {\bf{123}}, 114314 (2005)]. The nuclear spin-spin hyperfine structures arising from the $ortho$-H$_{2}$ molecules could be resolved and used to determine trends in the structural and dynamical properties of the clusters. The moments of inertia smoothly increase from $N$ = 1 to 12. Further solvation of the nitrous oxide molecule with additional $para$-H$_{2}$ molecules is required to detect the possible onset of "molecular superfluidity".
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Author Institution: Department of Chemistry, University of Alberta, Edmonton, AB; T6G 2G2, Canada