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	Determination of ionization coefficient of atmospheric helium in dielectric barrier discharge
	Liang Zhuo ; Luo Hai-Yun ; Wang Xin-Xin ; Lv Bo ; Guan Zhi-Cheng ; Wang Li-Ming
	2010-05-06 ; 2010-05-06
关键词	ARGON Physics, Multidisciplinary
中文摘要	A weakly luminous layer close to the anode is observed at time far ahead of the current pulse in dielectric barrier discharge of helium at atmospheric pressure and it is considered as the result of a very weak Townsend discharge. Based on the assumption that the space charge produced by this Townsend discharge is too small to distort the uniform electric field in the gas gap, the electrons have more or less the same energy over the entire gap and the spatial distribution of the discharge light is proportional to the distribution of electron density. This light distribution is obtained by processing side-view photograph of discharge gap using an intensified charge coupled device camera with an exposure time of 20 ns. By fitting a theoretically derived formula with the measured curve of light distribution, the Townsend electron ionization coefficient a is determined to be 31 cm(-1) at E/p = 3.6V . cm(-1) . Torr(-1), which is much higher than that obtained by solving the Boltzmann equation of pure helium. It is believed that penning ionization of helium metastables with impurity of nitrogen molecules makes great contribution to the experimentally determined a value. The contribution of this penning ionization to a is roughly estimated.
语种	英语 ; 英语
出版者	IOP PUBLISHING LTD ; BRISTOL ; DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/11165]
专题	清华大学
推荐引用方式 GB/T 7714	Liang Zhuo,Luo Hai-Yun,Wang Xin-Xin,et al. Determination of ionization coefficient of atmospheric helium in dielectric barrier discharge[J],2010, 2010.
APA	Liang Zhuo,Luo Hai-Yun,Wang Xin-Xin,Lv Bo,Guan Zhi-Cheng,&Wang Li-Ming.(2010).Determination of ionization coefficient of atmospheric helium in dielectric barrier discharge..
MLA	Liang Zhuo,et al."Determination of ionization coefficient of atmospheric helium in dielectric barrier discharge".(2010).

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