Physics – Atomic Physics
Scientific paper
Jan 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990nascp3058...87a&link_type=abstract
In NASA, Goddard Space Flight Center, Annihilation in Gases and Galaxies, NASA CP-3058 p 87-89 (SEE N90-18957 11-70)
Physics
Atomic Physics
Atomic Energy Levels, Born Approximation, Hydrogen Atoms, Positrons, Scattering Cross Sections, Atomic Collisions, Atomic Physics, Calculus Of Variations, Pions, Polarization (Waves), Symmetry, Wave Functions
Scientific paper
Above incident energies of about 2 eV, the contribution to the total cross section in positron+H2 scattering from the sigma g+ symmetry is insufficient to account for the experimental value. Calculations carried out of the lowest partial waves of sigma u+ symmetry and Pion u symmetry using the Kohn variational method are described. The contributions to the total cross section from the two equivalent partial waves of Pion u symmetry significantly reduce the discrepancy with experiment up to incident energies of 4 to 5 eV. Comparisons are made with recent R-matrix calculations performed by Danby and Tennyson.
Armour E. A. G.
Baker David John
Plummer M.
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