• A S Ramachandran

      Articles written in Pramana – Journal of Physics

    • Elastic-scattering cross-section for electrons and positrons from atomic hydrogen

      V L Narasimham A S Ramachandran C S Warke

      More Details Abstract Fulltext PDF

      The differential cross-sections of atomic hydrogen for elastic scattering of electrons and positrons have been rederived with the help of a method using a single parameter-dependent unitary shift operator for the calculation of the direct contribution. When the parameter approaches zerc the new method leads to the well-known conventional Glauber results. The numerical calculations include polarization effects and the exchange corrections obtained according to alternative approximation methods. Results calculated with Franco’s exchange show a definite improvement over the earlier results for medium energy electrons at large angles of scattering. Total elastic cross-sections have been calculated for 50 and 100eV electrons and positrons.

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