Formation of an atomic hydrogen beam by a hot capillary
Formation of an atomic hydrogen beam by a hot capillary
复制标题
通过热毛细管形成原子氢束
DOI：
--
复制
发表时间：
1998
期刊：
影响因子：
--
通讯作者：
V. Bonin
中科院分区：
文献类型：
--
作者：
K. Tschersich;V. Bonin
氢原子束的产生是通过使氢气通过由电子撞击加热到2600 K的钨毛细管。利用差分抽运四极质量分析器测量了不同氢源压力下氢原子的角分布。角分布比余弦分布明显更尖，并且进料压力越低，角分布越窄。基于分子流形成光束的理论，建立了一个简单的分析模型，该模型假设毛细管末端存在空间有限的透明流。以透明流长度为唯一拟合参数的模型可以描述测量的角分布。
A beam of atomic hydrogen is produced by passing hydrogen gas through a tungsten capillary heated to 2600 K by electron impact. By means of a differentially pumped quadrupole mass analyzer the angular distribution of the atomic hydrogen is measured for different hydrogen feed pressures. The angular distribution is considerably more peaked than a cosine distribution and is narrower the lower the feed pressure is. Based on the theory of beam formation by molecular flow a simple analytical model is developed which assumes a spatially limited transparent flow at the end of the capillary. The measured angular distribution can be described by the model using the length of transparent flow as the only fitting parameter.