# INTERACTION POTENTIALS OF GROUND STATE RARE GAS HALIDES

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 Title: INTERACTION POTENTIALS OF GROUND STATE RARE GAS HALIDES Creators: Becker, C. H.; Casavecchia, P.; Valentini, J. J.; Lee, Y. T. Issue Date: 1978 Publisher: Ohio State University Abstract: The interaction potentials foe the systems F + Ne Kr, Xe and Cl + Xe have been investigated from the measurements of differential scattering cross sections $[\sigma(\theta)]$ at various collision energies by crossing two supersonic atomic beams, F (C1) atoms were produced by thermal dissociation in a resistively heated nickel (graphite) oven using rare gases as carriers. In addition to $^{2}P_{3/2}$ ground state, the halogen atom beam contains an appreciable amount of spin-orbit excited state, $^{2}P_{1/2}$. From the $^{2}P_{3/2}+^{1}S_{O}(^{2}P_{1/2}+^{1}S_{O})$ asymptote emerge $^{2}\Pi_{1/2}$ and $^{2}\Pi_{3/2}\;(^{2}\Pi_{1/2})$ states. Data analysis proceeds by assuming an analytic form for the potentials $^{2}\Pi_{1/2}(X\frac{1}{2}),\;^{2}\Pi_{3/2}\;(I\frac{3}{2}), ^{2}\Pi_{1/2}(II\frac{1}{2})$ (where $V_{I}\frac{3}{2}(R)+E_{SO}=V_{II}\frac{1}{2}(R),\;E_{SO}$ is the spin-orbit atomic splitting) and using the central field approximation for scattering from each"" state to derive a total $\sigma(\theta):\sigma_{tot}(\theta)=\sigma_{X}\frac{1}{2}(\theta)+\sigma_{I}\frac{3}{2}(\theta)+a\sigma_{II}\frac{1}{2}(\theta)$. The factor a takes into account the fraction of the spin-orbit excited state $^{2}P_{1/2}$ produced in the oven. The $I\;(\frac{3}{2})$ and $II\;(\frac{1}{2})$ potentials are assumed to be very near the corresponding rare gas pairs and the greatest sensitivity in fitting the $\sigma(\theta)$ comes from the $V_{X}\; \frac{1}{2}$ (R) potential. Agreement between calculated and experimental $\sigma(\theta)$ is good. Where spectroscopic data exist, for F-Xe, and Cl-Xe, the $V_{X}\frac{1}{2}\;(R)$ agreement is excellent. Quantum mechanical close coupling calculations are now underway for comparison, and to obtain absolute integral cross sections for elastic and inelastic channels. Description: This work was supported by ONR and by the Materials, Chemical and Nuclear Science Division of the Department of Energy. Author Institution: Materials and Molecular Research Division, Lawrence Berkeley Laboratory and Department of Chemistry University of California URI: http://hdl.handle.net/1811/10436 Other Identifiers: 1978-MG-14