Abstract
Integrated and differential cross sections for vibrationally elastic - scattering from 0 to 1000 eV are calculated by means of the continuum multiple-scattering method (CMSM) with the Hara free-electron-gas and semiclassical exchange approximations. The present results represent a significant improvement over earlier CMSM calculations employing the Slater exchange approximation. The physical basis for this improvement is discussed. Resonance structures appear at 2.4, 13, and 26 eV in the , , and channels, respectively; however, the latter two are very weak and only the resonance has been observed in elastic scattering. Agreement between the present calculation and experiment is good over the entire energy range, although at fixed (equilibrium) internuclear distance, the resonance is too narrow and high. The agreement at the resonance is significantly improved by taking into account the effects of nuclear motion in the adiabatic nuclei approximation.
- Received 14 February 1979
DOI:https://doi.org/10.1103/PhysRevA.21.85
©1980 American Physical Society