• Electron impact excitation of hydrogen and helium in Coulomb-projected Born methods

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    • Keywords


      Electron impact excitation; hydrogen; helium; Coulomb projection; screening; distorted wave; exchange potential; antisymmetrized

    • Abstract


      Coulomb-projected Born methods for the theoretical study of electron impact excitation of hydrogen and helium are reviewed. The results obtained by using different forms of Coulomb-projected Born methods are compared with other theoretical and experimental results and analyzed. The inadequacy of the variable charge Coulomb-projected Born approximation (VCCPB)—the most recent form of the Coulomb-projected Born methods—in giving good results in processes where exchange is dominant is discussed in detail. The ‘modified’ VCCPB approximation obtained by modifying the VCCPB method to remove its shortcomings is also discussed and its application to electron impact excitation of 23s state of helium is studied.

    • Author Affiliations


      C S Singh1 D K Rai1

      1. Department of Physics, Banaras Hindu University, Varanasi - 221 005, India
    • Dates

  • Pramana – Journal of Physics | News

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      Posted on July 25, 2019

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