Exchange and correlations in Ps-atom and Ps-molecule scattering
Last updated April 26, 2018 by Alessandro Ferraro
Monday, April 16th 2018, 04:00 PM, MAP/0G/017
Speaker: I. Fabrikant (University of Nebraska)
Abstract: Exchange and correlations play an essential role in positronium (Ps) collisions with atom and molecules, since the static potential for Ps interaction with a neutral system is zero. Theoretical description of both effects is a very challenging task. In the present work we use the free-electron-gas model to describe exchange and correlations in Ps collisions with molecules similar to the approach widely used in the theory of electron-molecule collisions. The results for exchange and correlation energies are presented as functions of the Fermi momentum of the electron gas and the Ps incident energy. Using the Thomas-Fermi model, these functions can be converted into exchange and correlation potentials for Ps interaction with molecules as functions of the distance between the projectile and the target.
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