Calculations of Scattering Cross Sections and Annihilation Rates in Low Energy Collisions of Positrons with Molecular Hydrogen

摘要: An analysis of the requirements for an accurate calculation Zeff, effective number electrons per molecule available to positron annihilation, low energy e+H2 scattering using Kohn method shows importance including basis functions which contain positron-electron distance as a linear factor, i.e. Hylleraas-type functions. Such are very complicated include they not separable, cannot be expressed finite expansion one particle However, I have been able extend lowest partial wave and sets involving only separable functions, described at last Workshop Detroit in 1985, The results Zeff energies much closer experimental value than any that obtained previously. inclusion also has significant effect on phase shift total cross section, bringing section into agreement with experiment incident up about 2 eV. As far am aware, this is first time used molecular calculation.