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		题名	作者	年代	出处	被引量
	1	Effects of discharge current and voltage on the high density of metastable helium atoms显示文摘Both hollow-cathode and Penning-type discharges were adopted toexcite helium atoms to a metastable state. Experimental data indicate that Penning discharge is more suitable for generating high fractions of metastables in a low-density helium hean for laser-induced fluorescence technique in measuring electric fields at the edge of a plasma. The metastable density increases with increasing helium gas pressure in the range of 1.33×10^-2-66.7Pa. The highest metastable density of 3.8×10^16m^-3 is observed at a static gas pressure of 66.7Pa. An approximately linear relationship between the density of metastable helium atoms and the plasma discharge current is observed. Magnetic field plays a very important role in producing a high density of metastable atoms in Penning discharge.	FengXian-Ping DAndruczyk BWJames KTakiyama SNamba TOda	2003	Chinese Physics B2003，12，5：	3

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