[en] The results of electron-sodium scattering for the 3D → 3P transition at the projectile energy of 5 eV calculated using the Convergent Close Coupling method are presented. These include spin-resolved and spin-averaged alignment, orientation, and coherence parameters, as well as differential cross section and spin asymmetry. This calculation simultaneously produces results for the transitions 3P→3P at 6.52 eV and 3S → 3P at 8.62 eV. The three transitions are used to study the nature of the convergence in the close-coupling expansion. The results were found to be in good agreement with the existent experimental data. 15 refs., 9 figs

No abstract available

[en] We consider the recently measured case of 730 eV electron-impact ionization of the ground state of helium with 205 and 500 eV coplanar outgoing electrons by Catoire et al. [J. Phys. B 39, 2827 (2006)]. These measurements, which are on a relative scale, show some unexpected structure and variation from the second-order distorted-wave Born approximation R-matrix and Brauner-Briggs-Klar theories. Using the convergent close-coupling method we provide an improved agreement with experiment, but some discrepancies still remain

[en] Theoretical study of electron scattering from the 4P_1/2 ground state of gallium atoms is reported. We have used relativistic convergent close-coupling method to obtain cross sections for elastic scattering and excitations of the 4P_3/2, 5S_1/2, 5P_1/2,3/2 and 4D_3/2,5,2 states for incident electron energies ranging from 0.1 to 500 eV. Comparison of our results with recent theoretical estimates that have been used in plasma modeling shows significant discrepancies for all considered transitions.

[en] Unitarity of the close-coupling formalism ensures that the total ionization cross section converges much faster than its individual l-components (Bray 1994 Phys. Rev. Lett. 73 1088). However, convergence in the latter is required when obtaining differential cross sections. This can be computationally difficult whenever the ionization threshold is relatively small, as is the case for sodium. Nevertheless, we present convergent close-coupling calculations of fully differential cross sections for electron-impact ionization of sodium and find very good agreement with the available experiment from near threshold through to high energies.

[en] An overview is provided of the convergent close-coupling calculations for electron- impact on neutral beryllium, as well as its various ionic stages. The calculations were performed from near threshold to high energies with initial states having principal quantum number n ≤ 4. Excitation to states with n ≤ 5 and total ionisation cross sections have been calculated with an estimated accuracy of below 10% at all energies considered

[en] We have extended the nonrelativistic convergent close-coupling (CCC) method to the calculation of positron scattering from noble gases within the single-centre approximation. Good agreement is found with the available measurements of total cross sections and elastic differential cross sections for Ne, Ar, Kr and Xe.

[en] Electron impact ionization of the ground state of helium is measured and calculated for the case of 64.6 eV incident electrons with coplanar outgoing 20 eV electrons. Various geometries are considered: symmetric, fixed θ_A and fixed θ_B - θ_A. The method of calculation is the convergent close-coupling theory. This theory is able to reproduce the angular profiles in essentially all of these geometries, yet it yields a constant factor of approximately two lower cross sections than experiment. 14 refs., 4 figs

[en] We report on the recent applications of the convergent close-coupling method to electron impact ionisation of atoms and ions. Total and fully differential cross sections are considered. Some excellent agreement with experiment is identified, but some long-standing discrepancies still remain.

[en] The convergent close-coupling method is applied to the calculation of 10 to 55 eV electron-impact 4¹P excitation of the calcium ground state. The results are compared with experiment and other theories. Though the overall agreement may be considered satisfactory there are some minor outstanding discrepancies that would benefit from further consideration, both theoretically and experimentally