globalchange  > 科学计划与规划
DOI: 10.1002/2015GL067175
论文题名:
Plasma potential in the sheaths of electron-emitting surfaces in space
作者: Wang X.; Pilewskie J.; Hsu H.-W.; Horányi M.
刊名: Geophysical Research Letters
ISSN: 0094-9450
EISSN: 1944-9181
出版年: 2016
卷: 43, 期:2
起始页码: 525
结束页码: 531
语种: 英语
英文关键词: airless bodies ; electron-emitting surface ; photoelectrons ; plasma potentials ; secondary electrons ; sheath
Scopus关键词: Carrier concentration ; Electric fields ; Electron density measurement ; Electron emission ; Electrons ; Laser produced plasmas ; Photoelectrons ; Secondary emission ; Surface potential ; Airless bodies ; Emitting surface ; Plasma potential ; Secondary electrons ; Sheath ; Electron temperature ; atmospheric electricity ; electric field ; electron ; electron density ; plasma
英文摘要: Sheaths are formed around the surfaces of airless bodies, which both collect and emit electrons. Depending on the ratio of the emitted to collected electron fluxes Γ, the sheath potential structure can be quite different. We present the first experimental measurements of all the three types of the sheath potentials: classical, space-charge-limited (SCL), and inverse. A solid surface immersed in plasmas emits secondary electrons. The potential structure changes from a monotonic classical to a nonmonotonic SCL sheath as Γ increases. At the critical electron emission with zero electric field at the surface, the sheath potential is determined by the plasma electron temperature, and Γ approaches but remains smaller than 1, in agreement with the theoretical expectation. The nonmonotonic SCL sheath persists steadily for Γ > 1. When the emitted electron density becomes larger than the plasma electron density, a monotonic inverse sheath forms with a positive surface potential relative to the ambient. © 2016. American Geophysical Union. All Rights Reserved.
URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84958047419&doi=10.1002%2f2015GL067175&partnerID=40&md5=7c023e54a75eb7b7bb1de8f57da643f9
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/10413
Appears in Collections:科学计划与规划
气候变化与战略

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作者单位: Institute for Modeling Plasma, Atmospheres and Cosmic Dust, University of Colorado Boulder, Boulder, CO, United States

Recommended Citation:
Wang X.,Pilewskie J.,Hsu H.-W.,et al. Plasma potential in the sheaths of electron-emitting surfaces in space[J]. Geophysical Research Letters,2016-01-01,43(2).
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