Physics – Atomic and Molecular Clusters
Scientific paper
1999-11-23
Phys.Rev. A59 (1999) 363-370
Physics
Atomic and Molecular Clusters
16 latex pages, 7 postscript figures
Scientific paper
10.1103/PhysRevA.59.363
The formulation of a suitable nonlocal model potential for electron exchange is presented, checked with electron-hydrogen and electron-helium scattering, and applied to the study of elastic and inelastic scattering and ionization of ortho positronium (Ps) by helium. The elastic scattering and the $n = 2$ excitations of Ps are investigated using a three-Ps-state close-coupling approximation. The higher ($n\ge 3$) excitations and ionization of Ps atom are treated in the framework of Born approximation with present exchange. Calculations are reported of phase shifts, and elastic, Ps-excitation, and total cross sections. The present target elastic total cross section agrees well with experimental results at thermal to medium energies.
Adhikari Sadhan K.
Biswas Prasanta K.
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