Studies of electron with He using the Schwinger variational principle

Summary form only given, as follows. Numerical modeling of materials-processing plasmas depends on the availability of an extensive data base of cross sections for the relevant collision processes. Especially important are the cross sections are responsible for the transfer of energy to molecules (or atoms) that leads to dissociation and ionization. The data base of such cross sections is well recognized to be inadequate, and experimental determinations are quit difficult. The demand for data on the collision cross section of low (intermediate)-energy electrons and gaseous targets has continued to grow, owing to the expanding use of cold plasma in the processing and fabrication of materials. The theoretical approaches have the potential to make a significant contribution, provide that reliable numerical methods and the computational resources necessary for their implementation are available. In order to do this, we have reported cross sections for the electron scattering by He. These cross sections were obtained using the Schwinger Variational Principle (SVP) and in our procedures the scattering wave function is expanded as a combination of plane waves. In the present implementation the exchange potential and polarization effects, are treated using the Born-Ochkur model and Buckingham polarization potential. Our study suggest that the SVP with plane waves expansion may become an efficient method for studing e- He scattering.