Coupled-channel Optical Calculation Of Low-energy Electron-Sodium Scattering

Low-energy electron collision with sodium exhibits dramatic negative-ion resonances, consisting of the temporary bounding of the incident electron with target atom, which have significant contributions to the total cross sections.In the present work we employed the momentum space coupled-channel optical potential (CCO) method to calculate the low-energy scattering of electrons by sodium at incident energies up to ionization threshold and predict the positions and the configurations for most of the lower-lying resonances. The present results are in good agreement with available experimental data and previous theoretical calculations. Furthermore, some higher-lying resonances are put forth propositionally at the energies near the ionization threshold, which are especially agreement with the resonance series observed by Johnston and Burrow.We also calculated the total cross sections for low-energy positron-Sodium scattering and the present results have shown significant resonances in the region of 2-4 eV. Further calculation will be performed in the future work.