Microwave excitation of a low-energy atomic hydrogen
Microwave excitation of a low-energy atomic hydrogen
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低能原子氢的微波激发
DOI：
10.1088/1361-6595/ab5e60
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发表时间：
2020
影响因子：
3.8
通讯作者：
Wada Motoi
中科院分区：
文献类型：
--
作者：
Shimabukuro Yuji;Takahashi Hidenori;Iwamoto Shinichi;Tanaka Koichi;Wada Motoi
比较了不同等离子体激发配置的微波驱动紧凑型中性束源在产生用于生物分子结构分析的定向低能原子束方面的性能。波束源本身包括独特的阻抗匹配系统，以减小波束源的尺寸；多转螺旋天线利用2.45 GHz的微波功率成功地激励了内径为4 mm的氧化铝管内的氢等离子体。镜面磁场和电子回旋共振的组合已被发现在低工作压力(∼10−3Pa.)下实现源操作是有效的。这种磁场结构产生了氢等离子体，其光发射光谱以原子线为主，表明高度解离。在这种类型的源中激发的等离子体表现出一种类似于模式转变的行为，这在其他源几何结构中没有得到证实。
Performances of microwave driven compact neutral beam sources of different plasma excitation configurations have been compared in producing directed low energy atomic beams for biomolecular structural analyses. The beam sources include unique impedance matching systems in themselves for reducing the size of the source; a multi-turn spiral antenna successfully excited a hydrogen plasma in a 4 mm inner diameter Al 2 O 3 tube by 2.45 GHz microwave power. A combination of a mirror magnetic field and electron cyclotron resonance has been found effective to realize a source operation at a low operating pressure (∼ 10− 3 Pa). This magnetic field configuration produced a hydrogen plasma with the optical emission spectrum predominated by atomic lines indicating a high degree of dissociation. The plasma excited in this type of source exhibited a mode transition like behavior which was not confirmed in other source geometries.