Impact Polarization and Alignment Creation Parameters Via Stepwise Excitation Processes

We report here results from first order many body theory, distorted wave approximation, and converged close coupling calculations for polarization fractions and alignment creation parameters in the case of 21S → n1P(n = 3–5), 23S → n1P(n = 2–5), 21S → n1D(n = 3–5), 23S → n1D(n = 3–5), 23S → n3D(n = 3–5), and 21S → n3D(n = 3–5) excitations in helium for electron impact energies from threshold to several hundred eV.