Interpretation of Experimental Differential Elastic Scattering Cross Section forH++ Ne

The result of a differential scattering experiment of ${\mathrm{H}}^{+}$ by Ne at 5.71-eV collision energy is compared to the differential cross section predicted by (a) a JWKB partial-wave calculation based on a potential model, (b) a similar calculation based on the ab initio Peyerimhoff calculated intermolecular potential for the Ne${\mathrm{H}}^{+}$ system, and (c) a new and more efficient calculational scheme developed by Remler involving Regge poles. The agreement of the Peyerimhoff prediction, (b), with the experimental data is very good. Differences between the Peyerimhoff potential and the final values of the parameters retrieved from the iterative calculation in (a), as well as implicit ambiguities of (a) in reproducing the features of a low-resolution experiment, are discussed in terms of semiclassical theory and the Remler-Regge method.