An ivestigation of high fractions of metastable helium atoms

作     者：X.P.Feng B.W.James 

作者机构：PhysicsDepartmentEastChinaUniversityShanghai200051 SchoolofPhysicsTheUnivesityofSydneytNSW20006Australia 

出 版 物：《Chinese Optics Letters》 (中国光学快报（英文版）)

年 卷 期：2003年第1卷第4期

页      面：187-189页

核心收录：

学科分类：07[理学] 070204[理学-等离子体物理] 0702[理学-物理学] 

基　　金：澳大利亚资助 东华大学基金 上海市科委项目 

主　　题：Atoms Magnetic fields 

摘      要：Penning type discharge was adopted to excite helium *** is suitable for generating high density metastables at a range from 0.1m Torr to 0.5 *** highest metastable density of 3.5×10^10 cm^-3 was observed at a static gas pressure of 0.5 *** highest fraction of metastables(N2S^-1/Nhe) of 10^-3 in a low gas pressure was *** varation of the magnetic field strength on the discharge does not result in a significant density change of the metastable helium *** no magnetic field was applied,no discharge took phace.