Formation and destruction of striation plasmas in helium glow discharge at medium pressures  

作　　者：Hailong ZHU Qixiang HUANG Yifan WU Yurui LI Kechang REN 朱海龙;黄琪翔;吴一繁;李昱瑞;任克昌(College of Physics and Electronics Engineering,Shanxi University,Taiyuan 030006,People’s Republic of China)

机构地区：[1]College of Physics and Electronics Engineering,Shanxi University,Taiyuan 030006,People’s Republic of China

出　　处：《Plasma Science and Technology》2022年第5期176-182,共7页等离子体科学和技术（英文版）

基　　金：supported by National Natural Science Foundation of China(No.11875039)。

摘　　要：The striation plasmas are usually generated within a positive column of glow discharge,where rich and complex physical interactions are involved,especially,in the medium or high pressures.Along these lines,our work aims to thoroughly investigate the formation and destruction of helium striation plasmas at kPa level pressures.The characteristics of the helium striation plasmas,and especially the optical emission properties are explored.The emission lines of 706.52 nm and391.44 nm related to the energetic electrons and the high-energy metastable helium atoms respectively,were focused on in this work.The formation of striation plasmas in a helium glow discharge,is mainly associated with the instability originating from the stepwise ionization of high-energy metastable state atoms,Maxwellization of the electron distribution functions and gas heating.Additionally,the destruction effect of helium striation plasmas is of great significance when a small amount of nitrogen or oxygen is mixed into the discharge plasmas.The reduction of the mean electron energy and the consumption of the high-energy metastable helium atoms are considered as the underlying reasons for the destruction of striation plasmas.

关 键 词：striation plasmas medium pressures atomic emission spectroscopy helium discharge metastable atoms ionization wave 

分 类 号：O461.21[理学—电子物理学] O53[理学—物理]