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Importance of Relativistic Effects for Intermediate-Z Elements: Photoionization Process of Excited Na |
| HAN Xiao-Ying 2,1;WANG Xiao-Lu 2;VOKY Lan 3;FEAUTRIER Nicole 3;LI Jia-Ming 1,2 |
| 1Department of Physics, Shanghai Key Laboratory for Laser Fabrication and Material Science, Shanghai Jiao Tong University, Shanghai 2000302Key Laboratory of Atomic and Molecular Nanosciences of Education Ministry, Department of Physics, Tsinghua University, Beijing 1000843LERMA, UMR 8112 du CNRS, Observatoire de Paris, 92915 Meudon Cedex, France |
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| Cite this article: |
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HAN Xiao-Ying, WANG Xiao-Lu, VOKY Lan et al 2007 Chin. Phys. Lett. 24 909-912 |
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Abstract Using a modified R-matrix code, the fine-structure-resolved partial photoionization cross sections of excited Na (Z=11) are calculated within the Breit--Pauli approximation. Our calculated energy levels of Na+ and Na are in good agreement with the experimental values within 1% and the branching ratios of the J-resolved partial cross sections are consistent with the recent measurements within the experimental uncertainties. The agreements are impossible to be obtained without adequately taking into account the relativistic effects and the electron correlations together. Therefore, even for the intermediate-Z elements (e.g. Na with Z=11), the relativistic effects (mainly the spin-orbit interactions) should not be neglected.
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| Keywords:
31.15.Ar
31.25.Jf
32.80.Fb
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Received: 12 October 2006
Published: 26 March 2007
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