The scattering of 40 eV electrons from magnesium: a polarization correlation study for the 3(1)P state and differential cross sections for elastic scattering and excitation of the 3(1)P and 3(3)P states

D.O. Brown, Danica Cvejanovic, A. Crowe

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    Abstract

    Excitation of the 31P state of magnesium by 40 eV electrons has been studied experimentally using the polarized photon-scattered electron correlation method over a wide range of scattering angles (10°–120°). Measured Stokes parameters are consistent with the small angle (≤20°) data of Brunger et al (1989 J. Phys. B: At. Mol. Opt. Phys. 22 1431–32). The measured linear Stokes parameters, and the circular polarization calculated from these parameters, assuming coherent excitation, are generally well produced by recent theoretical models, convergent close coupling, R-matrix with pseudo states, relativistic distorted wave and first-order many-body theory. Despite extensive testing, directly measured circular polarization data yielded low values at most scattering angles beyond 20°. Differential cross sections for elastic scattering and excitation of the 31P and 33P states were also measured over the angular range 10°–140° and compared with theoretical predictions.
    Original languageEnglish
    Pages (from-to)3411 -3423
    JournalJournal of Physics B: Atomic, Molecular and Optical Physics
    Volume36
    Issue number16
    DOIs
    Publication statusPublished - 2003

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