• Trilochan Pradhan

      Articles written in Pramana – Journal of Physics

    • Feynman diagram approach to atomic collisions

      Babaji Charan Mishra Trilochan Pradhan

      More Details Abstract Fulltext PDF

      A quantum field theoretic formulation of atomic collision phenomena involving non-relativistic free and bound systems is developed and a calculational procedure in terms of Feynman diagrams is prescribed. Matrix elements of several atomic collision processes have been calculated. In most cases standard quantum mechanical results are reproduced. But in some cases new terms appear in the scattering matrix whose contribution though negligibly small in the low energy region, become important at higher energies.

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