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戴利侦测器

戴利侦测器
戴利侦测器示意图
发明者诺曼·理查·戴利英语Norman Richard Daly
相关事物微通道板
电子倍增管

戴利侦测器是一种由“门把”(doorknob)、闪烁器(荧光屏)与光电倍增管组成的真空离子侦测器[1]。戴利侦测器的名称是依其发明者诺曼·理查·戴利英语Norman Richard Daly(Norman Richard Daly)的姓氏来命名。戴利侦测器通常用在质谱仪中,尤其是在需要非常高侦测灵敏度的仪器,如交叉分子束方法

原理

欲侦测的离子进入侦测器,被加速撞击“门把”后产生多个二次电子。在“门把”与闪烁器间的高电压(约 −20,000 V)下,电子被加速撞击荧光屏,转换为多个光子。这些光子最后由光电倍增管收集。戴利侦测器是非常灵敏的侦测器,可以用来作离子计数用。其他相关的侦测器有:光电倍增管、电子倍增管微通道板

参考文献

  1. ^ Daly, N. R., Scintillation type mass spectrometer ion detector, Rev. Sci. Instr., 1960, 3: 264–267, doi:10.1063/1.1716953 
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戴利侦测器
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