[en] Differential cross section results are calculated for the elastic scattering of electrons and positrons from the ground state of Rb and Cd atoms. An optical model potential approach is used for the calculation. Results are compared with the available electron impact experimental results

[en] A distorted wave approximation theory has been used to study 1s²2p²P→1s²3s²S excitation in lithium like ions by electrons and positrons. The results for differential cross-sections and collision strengths for C³⁺, N⁴⁺, O⁵⁺, F⁶⁺ and Ne⁷⁺ ions are obtained in the incident projectile energy range from two times to fifteen times threshold. These values are found to be in good agreement with the available results. (author). 32 refs., 3 figs., 4 tabs

[en] The method due to Crothers and McCarroll is extended to study the resonance and nonresonance excitations in the neutral alkali atoms by impact of heavy projectiles (viz. H⁺, H₂⁺, H₃⁺, He⁺ and He²⁺). Total and differential cross sections are obtained for Li(2s ≥ 2p, 3s, 3p, 3d), Na(3s ≥ 3p, 3d) and K(4s ≥ 4p). In addition, the polarization fraction (π) of the transition as well as the alignment parameter (A₂₀) of the excited state in case of resonance excitations are calculated. The results obtained are compared with the other available theoretical and experimental results. The method is found to give quite reasonable description of the collisional processes considered. (author). 14 figs., 43 refs

[en] Elastic scattering of electrons and positrons by the cadmium atom is studied. A real optical potential is used to calculate the phase shifts of the first few partial waves. Then the differential cross sections (DCS's) are calculated from the formula given by Nesbet [Phys. Rev. A 20, 58 (1979)] using the calculated phase shifts of the first few partial waves. The calculations are performed at incident projectile energies of 40, 60, 75, 85, 100, and 150 eV, where the experimental DCS measurements for electron scattering are available. The agreement between our calculated DCS and the available experimental DCS is reasonable at lower energies and very good at higher energies. Total cross sections are also obtained, but no other results, theoretical or experimental, are available for comparison with them