TOTAL CROSS-SECTIONS OF POSITRON SCATTERING FROM VARIOUS MOLECULES USING THE RULE OF ADDITIVITY

The total cross sections sigma(t) for positron impact on many diatomic and polyatomic molecules have been calculated using the additivity ru le in which the total cross section for a molecule is the sum of the t otal cross sections for the constituent atoms. The energy range is fro m 10 eV to 5000 eV. The total cross sections for positron impact bn an atom are calculated by employing a complex, spherical potential which is comprised of a static, polarization, and an absorption potential. We have good agreement with the available experimental results for pos itron energy greater than or equal to 30 eV.