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Collision Spectroscopy. I. Analysis of the scattering of He+ by Ne and Ar

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Author
Smith, F.T.
Marchi, R.P.
Aberth, W.
Lorents, D.C.
Heinz, O.
Date
1967-09-05
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Abstract
Experimental data on the differential scattering of He+ by Ne and Ar in the energy range from 10 eV to 100 keV are plotted in a reduced coordinate system suggested by a scaling law for the forward scattering. The resulting curves are used to determine the interaction potential. The repulsive interaction dominating at higher energies shows pronounced shell-structure effects; leading to the deduction of the screening constants for the L and M shells of Ar and for the K and L shells of Ne. At lower energies a polarization attrac­tion appears, allowing deduction of the polarizabilities of Ne and Ar. A simple analytic potential is constructed, including a polarizability term appropriately damped inside the outer shell, which fits the data over the entire range. In addition to the pure elastic scattering, effects of inelastic interactions are diagnosed. A prominent curve crossing is located and the scattering pattern arising from it is interpreted by a semiclassical theory. In collisions with closer encounters, a different type of inelastic. process appears which apparently involves a more intense coupling than the curve crossing and which appears to open up a number of competing inelastic channels.
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This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.
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http://hdl.handle.net/10945/47763
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