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 …

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 …

ELECTRON SCATFERING BY ATOMS AT INTERMEDIATE ENERGIES I. Theoretical Models BH
BRANSDEN and MRC McDOWELL Page 1 PHYSICS REPORTS (Section C of Physics Letters) …

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 R-matrix method calculations of Berrington et al.(1975) and Fon et al.(1979) are
extended to the energy ranges 21.4< E< 30 eV and 80< E< or= 200 eV for the electron …

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 …

The authors applied the eikonal-Born series method to analyse the excitation of the 2 1 S
state of helium by electrons of energy E> 100 eV. The EBS results are in good agreement …

A ten-channel eikonal treatment of the n= 2 and 3 collisional excitations of helium by
incident electrons with energy E (eV) in the range 40< or= E< or= 500 is performed …

The R-matrix method calculations of Berrington et al.(1975) and Fon et al.(1978) are
extended to the calculation of the integrated and differential cross sections for electron …

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 …