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Measurement of Integrated Stokes Parameters for He 3 3P State Excited by Spin-Polarized Electrons |
| DING Hai-Bing;PANG Wen-Ning;LIU Yi-Bao;SHANG Ren-Cheng |
| Department of Physics, Tsinghua University, Beijing 100084 |
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| Cite this article: |
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DING Hai-Bing, PANG Wen-Ning, LIU Yi-Bao et al 2005 Chin. Phys. Lett. 22 2252-2254 |
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Abstract Integrated Stokes parameters Pi (i=1,2, 3) for the He 3 3P → 2 3S1 (388.9nm) transition after excitation from the ground state to the 3 3P state by a transversely spin-polarized electron beam are measured in near threshold energy region. The experimental results are presented. The linear-polarization P2 are consistent with zero over the incident energy range, providing evidence for the LS coupling mechanism of the 3 3P state. The measured circular polarization P3 are non-zero, indicating strong electron-electron exchange effects in the spin-polarized electron-atom collision process.
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| Keywords:
34.80.Nz
34.80.Dp
32.30.Jc
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Published: 01 September 2005
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| PACS: |
34.80.Nz
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(Spin dependence of cross sections; polarized beam experiments)
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34.80.Dp
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(Atomic excitation and ionization)
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32.30.Jc
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(Visible and ultraviolet spectra)
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