T L Gibson 1990 J. Phys. B: At. Mol. Opt. Phys. 23 767 doi:10.1088/0953-4075/23/4/010
T L Gibson
Show affiliationsA novel treatment of short-range correlation effects designed for use in calculating positron-atom and positron-molecule polarisation potentials is presented. The treatment is based on a physically motivated approximation that mimics the effect of the dominant non-adiabatic correction to the adiabatic potential at low scattering energies, namely virtual positronium formation. As an initial test of the method, positron-He scattering phaseshifts, scattering length and differential cross sections have been calculated and found to be in good agreement with accurate results. This method is immediately extendible to positron-molecule collisions and does not require significantly more work than a purely adiabatic treatment.
34.50.-s Scattering of atoms and molecules
31.15.-p Calculations and mathematical techniques in atomic and molecular physics
Issue 4 (28 February 1990)
T L Gibson 1990 J. Phys. B: At. Mol. Opt. Phys. 23 767
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