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    Ab initio method for calculating total cross sections (1993)
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    Publication Date: 2019-08-28
    Description: A method for calculating total cross sections without formally including nonelastic channels is presented. The idea is to use a one channel T-matrix variational principle with a complex correlation function. The derived T matrix is therefore not unitary. Elastic scattering is calculated from T-parallel-squared, but total scattering is derived from the imaginary part of T using the optical theorem. The method is applied to the spherically symmetric model of electron-hydrogen scattering. No spurious structure arises; results for sigma(el) and sigma(total) are in excellent agreement with calculations of Callaway and Oza (1984). The method has wide potential applicability.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Physical Review Letters (ISSN 0031-9007); 70; 13; p. 1936-1939.
    Format: text
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