Distorted Wave Method Calculation of Positron Impact Excitation of 21s State of Helium Atom

摘要

We have calculated the differential and integral cross-section for positron-helium scattering for the excitation of 1 1 S to 2 1 S state at impact energy range of 22-200eV using a distorted wave method. The results are compared with the available experimental and theoretical results. It is observed that at higher energies present results are in good agreement with other theoretical results.