Correlation effects in Xe^+ photoionization
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Photoionization of Xe and Xe@C60 have been studied using the random phase approximation with exchange method and our C60 model potential. The Xe atom was described by relaxed orbitals including overlap integrals. The Schrödinger equation for Xe@C60 was solved using both regular and irregular solutions and the continuous boundary conditions at inner and outer radii of the C60 shell. Better photoionization results for both Xe atom and Xe@C60 molecule have been obtained and compared with the experimental data.
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We have carried out measurements of absolute photoionization cross sections of the excited ${\mathrm{nd}}^{2}{D}_{3/2,5/2}$ states of cesium for principal quantum number $n=7$ and 8. Absolute cross sections have been determined experimentally using the technique of measuring depletion in the fluorescence signal from the excited states of atoms due to photoionization. The measurement was made with a linearly polarized ionization laser light at 532-nm wavelength. Photoionization cross sections have been determined as $(3.5\ifmmode\pm\else\textpm\fi{}1.4)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}18}$ cm${}^{2}$ and $(3.1\ifmmode\pm\else\textpm\fi{}1.2)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}18}$ cm${}^{2}$ for the ${7d}^{2}{D}_{3/2}$ and ${7d}^{2}{D}_{5/2}$ states, and $(2.4\ifmmode\pm\else\textpm\fi{}1.0)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}18}$ cm${}^{2}$ and $(1.6\ifmmode\pm\else\textpm\fi{}0.6)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}18}$ cm${}^{2}$ for the ${8d}^{2}{D}_{3/2}$ and ${8d}^{2}{D}_{5/2}$ states, respectively. We also propose an alternative method to measure the absolute cross sections for photoionization from highly excited Rydberg states, which is based on the methodology of the fluorescence depletion technique.
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It is demonstrated that the photoionization of Xe+ , leading to Xe2+ , is completely dominated by interchannel coupling between the strong 4d ionization channels and the valence 5s and 5p channels. Calculations were performed using the random-phase approximation with exchange (RPAE), generalized to apply to open-shell systems, which included ionization from 5p, 5s and 4d subshells in 2 S, 2 P and 2 D final channels. The results showed that Hartree-Fock cross sections are not even qualitativelycorrect over an energy region of ~100 eV. Comparison with (relative) experimental data shows quite reasonable agreement.
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We use R-matrix method to study the near threshold (17.5eV-20eV) photoionization of neutral fluorine atom and obtain total photoionization cross sections in 3P to 1D range. The theoretical calculation results fit the experimental results better after we consider core-valence electron correlation.
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