INFRARED-ACTIVE VIBRON BANDS ASSOCIATED WITH RARE GAS SUBSTITUTIONAL IMPURITIES IN SOLID HYDROGEN

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2005

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Ohio State University

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Solid para-hydrogen (pH$_2$) crystals doped with part per million concentrations of rare gas (Rg) atoms display a new zero phonon absorption feature which correlates with the pH$_2$ pure vibrational Q$_1$(0) transition. This Rg induced Q$_1$(0) absorption has been studied at high resolution for Ne, Ar, Kr, and Xe doped pH$_2$ crystals. The more polarizable the Rg atom, the more intense and red shifted is the induced pH$_2$ Q$_1$(0) feature. The frequency and lineshape of the transition provides information on how localized the vibron is around the Rg impurity. Comparison of the experimental data with a recent theoretical model is very favourable.} In addition, the Rg atom perturbs the S$_1$(0) pH$_2$ transition resulting in peaks that show fine structure which is interpreted as a lifting in the $m$$_J$ degeneracy of this $J$=2 upper state. Preliminary studies of Xe atom doped ortho-deuterium will also be presented and discussed.

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{R. J. Hinde, J. Chem. Phys. 119, 6 (2003).
Author Institution: Department of Chemistry, University of Wyoming, Laramie, WY 82071-3838

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