Igor Bray

TL;DR: In this paper, the convergent close-coupling method has been applied to positron scattering on a helium atom in the 2 {sup 3}S metastable state, where the positronium (Ps) formation channel is open even at zero scattering energy making the inclusion of the Ps channels especially important.

TL;DR: In this article, experimental and theoretical studies of the electron-impact excitation of the zinc atoms are reported, highlighting the significance of both channel coupling to the continuum and the inner $3d$-shell electrons.

TL;DR: In this article, the authors compared convergent close-coupling (CCC), the R-matrix with pseudo-states (RMPS), and the intermediate Rmatrix (IERM) methods and found that the behavior of the cross section in this energy region is closer to an threshold law than the dependence predicted by Temkin.

TL;DR: Using the convergent close-coupling method for the atomic hydrogen target, cross sections at near-threshold energies for electron and positron impact are examined and calculated cross sections are found to behave differently for the two projectiles and consistently with the aforementioned threshold laws, despite the entirely quantum nature of these problems.

TL;DR: In this article, the authors presented highly accurate relative measurements of 2 excitation of helium by electron impact at 30, 40 and 50 eV, when normalized to the convergent close-coupling (CCC) theory at one angle, yield excellent agreement at the remaining angles.