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Indirect Relativistic Effect in Electron--Alkali-Atom Collision |
| LIU Yi-Bao1,2;PANG Wen-Ning1;DING Hai-Bing1;SHANG Ren-Cheng1 |
| 1Department of Physics, Tsinghua University, Beijing 100084
2Department of Physics, East China Institute of Technology, Fuzhou, Jiangxi 344000 |
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| Cite this article: |
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LIU Yi-Bao, PANG Wen-Ning, DING Hai-Bing et al 2005 Chin. Phys. Lett. 22 1041-1044 |
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Abstract We present detailed studies on the differential cross section (DCS) and total cross section (TCS) in electron--alkali-atom collision processes by using two types of distorted wave methods, the ordinary distorted wave method and the indirect-relativistic distorted wave method. We find that the indirect relativistic effect in the target atom can be neglected in the TCS calculation in the processes; however, with an increase of the atomic number, this effect becomes significant in the DCS calculation. Then, based on the density matrix theory, the orientation and alignment parameters of excited caesium P states scattered by electrons at low incident energy are calculated, and comparisons are made for the two series between the two methods. The results show that accordance is reached at scattering angles smaller than 45°, but considerable difference appears at angles larger than 45° due to the relativistic effect.
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| Keywords:
03.65.Nk
11.80.-m
34.80.Dp
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Published: 01 May 2005
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| PACS: |
03.65.Nk
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(Scattering theory)
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11.80.-m
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(Relativistic scattering theory)
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34.80.Dp
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(Atomic excitation and ionization)
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