Asymmetry parameters and differential cross sections for photoionization-excitation of heliumProject supported by the Natural Science and Theoretical Education Foundation of Henan Province, China (1999140009).
Jiang Yu-hai; Sun Jin-feng; Zhu Zun-lue; Yang Qin-yu; Wan Ling-de; Jiang Yu-hai; College of Physics and Information Engineering, Henan Normal University, Xinxiang 453002, China; Sun Jin-feng; College of Physics and Information Engineering, Henan Normal University, Xinxiang 453002, China; Zhu Zun-lue; College of Physics and Information Engineering, Henan Normal University, Xinxiang 453002, China; Yang Qin-yu; College of Physics and Information Engineering, Henan Normal University, Xinxiang 453002, China; Wan Ling-de; College of Physics and Information Engineering, Henan Normal University, Xinxiang 453002, China
Журнал:
Chinese Physics
Дата:
2000-12-01
Аннотация:
Asymmetry parameter β<sup>2</sup> for photoionization of helium leaving the He<sup>+</sup> ion in the n=2 level and differential cross sections(DCSs) in the n=2,3,4 levels with photon emission angle θ=90° are provided at photon energies 69-76.8 eV employing the R-matrix method with a 20-term target representation, in which five polarization orbitals 6̅l are included. The asymmetry parameter β<sub>2</sub> and the DCS, in the n=2 level in the region of 69-73 eV, are in good agreement with available experimental and theoretical results. Above the n=3 threshold, we present new theoretical results along with measurements. No theoretical and experimental results can be used to compare with the present calculations of the DCSs for photoionization into the He<sup>+</sup> ion in the n=3,4 levels.
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