| An investigation of high fractions of metastable helium atoms |
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| 作者姓名： | 冯贤平 B.W.James |
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| 作者单位： | Physics Department，East China University Shanghai 200051，School of Physics，The University of Sydney NSW 2006，Australia |
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| 基金项目： | this work have been supported by Sydney University, Dong Hua University and the Shanghai Science and Technological Research Council (contract No. 0252nm110). X. P. Feng's e-mail address is xpfeng@dhu.edu.cn. |
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| 摘 要： | Penning type discharge was adopted to excite helium atoms. It is suitable for generating high density metastables at a range from 0.1 mTorr to 0.5 Torr. The highest metastable density of 3.5 x 1010 cm-3 was observed at a static gas pressure of 0.5 Torr. The highest fraction of metastables (N12s/Nhe) of 10-3 in a low gas pressure was obtained. The variation of the magnetic field strength on the discharge does not result in a significant density change of the metastable helium atoms. When no magnetic field was applied, no discharge took place.
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An investigation of high fractions of metastable helium atoms |
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| B.W.James.An investigation of high fractions of metastable helium atoms[J].中国光学快报(英文版),2003,1(4). |
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| Authors: | BWJames |
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| Abstract: | Penning type discharge was adopted to excite helium atoms. It is suitable for generating high densitymetastables at a range from 0.1 mTorr to 0.5 Tort. The highest metastable density of 3.5 × 1010 cm-3was observed at a static gas pressure of 0.5 Torr. The highest fraction of metastables (N21s/NHe) of 10-3in a low gas pressure was obtained. The variation of the magnetic field strength on the discharge doesnot result in a significant density change of the metastable helium atoms. When no magnetic field wasapplied, no discharge took place. |
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