Four-body treatment of the K-shell positronium formation from multi-electron atoms

Nuclear-Charge Screening in Positronium Formation from Helium Atoms

An analytical treatment of the electron screening effect within an active-electron model is given for positronium formation from helium atoms. A first-order distorted wave approximation with correct boundary conditions is applied to evaluate the transition amplitude. In the range of impact energy for which the introduced perturbative approach is valid, both the total and differential cross sect...

nuclear-charge screening in positronium formation from helium atoms

an analytical treatment of the electron screening effect within an active-electron model is given for positronium formation from helium atoms. a first-order distorted wave approximation with correct boundary conditions is applied to evaluate the transition amplitude. in the range of impact energy for which the introduced perturbative approach is valid, both the total and differential cross sect...

K-shell ionization of atoms by electron and positron impact.

Computation of electron-impact K-shell ionization cross sections of atoms

M. A. Uddin,* A. K. F. Haque, M. Masum Billah, A. K. Basak, K. R. Karim, and B. C. Saha Department of Physics, University of Rajshahi, Rajshahi-6205, Bangladesh Department of Physics, Illinois State University, Normal, Illinois 61790, USA Department of Physics, Florida A & M University, Tallahassee, Florida 32307, USA sReceived 1 November 2004; revised manuscript received 7 December 2004; publi...

Positronium formation from Li and Na atoms by use of pseudopotentials.

Th e differential and total cross sections for the formation of osi r ' ns or e ormation of positronium in its ground state from gy posi rons are calculated in the first Born and n a a oms y t e impact of intermediate-ener ositr is or e-wave orn approximations. Hellmann-type pseudo otentials are u res. e i erence in the use of pseudopotentials and the static potential for the core representatio...