INTERACTION POTENTIALS OF GROUND STATE RARE GAS HALIDES
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Date
1978
Journal Title
Journal ISSN
Volume Title
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
Author Institution: Materials and Molecular Research Division, Lawrence Berkeley Laboratory and Department of Chemistry University of California