| ATOMIC AND MOLECULAR PHYSICS |
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Positron-Impact Excitation of Hydrogen Atoms in Debye Plasmas |
| ZHANG Song-Bin1, QI Yue-Ying2,3, QU Yi-Zhi4, CHEN Xiang-Jun1, WANG Jian-Guo2 |
| 1Hefei National Laboratory for Physical Sciences at Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei 2300262Key Laboratory of Computational Physics, Institute of Applied Physics and Computational Mathematics, PO Box 8009, Beijing 1000883School of Electrical Engineering, Jiaxing University, Jiaxing 3140014College of Material Sciences and Optoelectronic Technology, Graduate school of the Chinese Academy of Sciences, PO Box 4588, Beijing 100049 |
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| Cite this article: |
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ZHANG Song-Bin, QI Yue-Ying, QU Yi-Zhi et al 2010 Chin. Phys. Lett. 27 013401 |
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Abstract The positron-impact excitation of hydrogen atoms embedded in plasma environments is investigated using the close-coupling approximation from the low to intermediate energy region without including any positronium formation channel, and the excitation cross sections for 1s→2s, 1s→2p and 2s→2p processes are calculated in a wide Debye parameter range. The screening interactions, described by the Debye-Hückel model, decrease the coupling matrix elements, resulting in the reduction of the excitation cross sections from a few percent to one magnitude of ten. This will alter remarkably the spectroscopy of hydrogen in intensity and position, which should be considered in the simulation and diagnostics under some specific plasma conditions.
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| Keywords:
34.85.+x
52.20.-j
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Received: 19 August 2009
Published: 30 December 2009
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