ASYMMETRY PARAMETERS AND DIFFERENTIAL CROSS SECTIONS FOR PHOTOIONIZATION-EXCITATION OF HELIUM |
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Authors: | Jiang Yu-hai Sun Jin-feng Zhu Zun-lue Yang Qin-yu Wan Ling-de |
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Affiliation: | College of Physics and Information Engineering, Henan Normal University, Xinxiang 453002, China |
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Abstract: | Asymmetry parameter β2 for photoionization of helium leaving the He+ ion in the n=2 level and differential cross sections(DCSs) in the n=2,3,4 levels with photon emission angle θ=900 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 bar{6}l are included. The asymmetry parameter β2 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+ ion in the n=3,4 levels. |
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Keywords: | Asymmetry parameter differential cross sections photoionization R-matrix |
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