Density measurement of negative hydrogen ions by DC laser photodetachment method
Density measurement of negative hydrogen ions by DC laser photodetachment method
复制标题
直流激光光脱离法测量负氢离子密度
DOI：
10.1143/jjap.34.l641
复制
发表时间：
1995
影响因子：
1.5
通讯作者：
M. Wada
中科院分区：
文献类型：
--
作者：
M. Yokoyama;M. Wada
测量了在氢放电过程中，由于Ar~+激光的照射，朗缪尔探头的电子饱和电流随探头与激光之间的距离的变化。激光诱导的氢负离子(H-)光剥离引起的探测电流的增加与距离成反比。根据探测电流的增加与激光探测距离的关系，可以确定H密度。然而，对测量特性的简化处理导致了对H密度的高估，并进行了修正以考虑探头周围的鞘层形成的影响。校正后测得的氢密度为电子密度的15%~50%。
The change of the electron saturation current of a Langmuir probe in a hydrogen discharge due to irradiation of Ar+ laser has been measured as a function of the distance between the probe and the laser beam. The increase of the probe current caused by the photodetachment of negative ions of hydrogen ( H-) induced by the laser is inversely proportional to the distance. The H- density can be determined from this dependence of the increase of the probe current upon the laser-probe distance. However, a simplified treatment of the measured characteristics results in an overestimation of the H- density, and a correction to account for the effect of sheath formation around the probe is made. The H- density determined after the correction ranges from 15% to 50% of the electron density.