SPECTROSCOPY OF THE TRIATOMIC RARE GAS HALIDES: $Rg_{2}X$
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Date
1977
Journal Title
Journal ISSN
Volume Title
Publisher
Ohio State University
Abstract
In the course of a detailed $study^{1}$ of the energy flow kinetics in e-beam excited $Ar/Kr/F_{2}$ mixtures, strong broad emissions were observed in the region of 290 nm and 400 nm. From a characterization of the pressure and temporal behavior of these emission features it was $concluded^{2}$ that the radiating molecules were not the well known ArF (193 nm) or KrF (248 nm) but rather triatomic species $Ar_{2}F$ (290 nm) and $Kr_{2}F$ (400 nm). Recent theoretical $work^{3}$ on $Ar_{2}F$ supports these assignments. We report here a more systematic study of the spectroscopy of the triatomic rare gas fluorides: $Ar_{2}F (290 \pm 25 \ nm), Kr_{2}F (400 \pm 30 \ nm)$, and chlorides $Ar_{2}Cl (246 \pm 14 \ nm), Kr_{2}Cl (325 \pm 15 \ nm)$, and $Xe_{2}Cl (450 \pm 20 nm)$. The wavelength shift from the diatomics is explained in terms of binding in the rare gas molecular ion in the excited state and repulsion between the neutral rare gas atoms in the ground state. These effects are illustrated using potential surfaces for $Ar_{2}F$ calculated by the Diatomics-in-Molecules method.
Description
$^{1}$ H. H. Nakano, R. M. Hill. D. C. Lorente, D. L. Huestis, M. V. McCusker, and D. J. Eskstrom, SRI Report MP 76-99, December 1976. $^{2}$ D. C. Lorents, R. M. Hill, D. L. Huestis, M. V. McCusker, and H. H. Nakano, Third Summer Colloquium on Electronic Transition Lasers, Snowmass-at-Aspen, Colorado, September 1976. $^{3}$ W. R. Wadt and P. J. Hay, to be published.
Author Institution: Molecular Physics Center, Stanford Research Institute
Author Institution: Molecular Physics Center, Stanford Research Institute