The study of polarization of atomic radiation emitted after impact excitation has yielded an
enormous wealth of detailed information on the mechanism and dynamics of collisional …

This article reviews a particular area of perturbation theory in which there has been much
activity during the past ten years. This area embraces distorted-wave Born series, the …

Positronium formation in positron scattering from hydrogen and helium atoms: the distorted-wave
approximation Page 1 Journal of Physics B: Atomic and Molecular Physics Positronium …

Distorted-wave methods in the theory of electron-impact exitation of atoms and atomic ions
are reviewed. Principal methods of derivation of the distorted wave approximation are …

Experimental data for the scattering of electrons by selected light atoms at intermediate
energies have been collected and compared with the predictions of the theoretical models …

The distorted-wave second Born approximation (DWSBA) has been applied to the elastic
scattering of electrons by ground-state atomic hydrogen and to the electron impact excitation …

Calculations are performed within the scope of the pseudopotential formalism to predict the
cross section for positronium formation during collisions of positrons with the alkali atoms …

A distorted-wave model is developed, for the ionisation of helium by electron impact at
intermediate energies, which takes into account polarisation and absorption in the initial …

First-order many-body theory has been used to calculate the differential and integral cross
sections for electron-impact excitation of the argon atom to the 4 P 0 3, 4 P 2 3, 4 P 1 3, and …

The second-order distorted-wave amplitude is evaluated in a high-energy approximation. In
this approximation, the non-local second-order distorting potential is replaced by a local …