具有阈值电离能力的四极质谱离化器的研制

Design and Study of Ionizer of QMS with Threshold Ionization Function

摘要: 我们已成功研制出国内第一台具有阈值电离能力的电子轰击电离四级质谱离化器。该离化器电子能量在8．5eV～95eV范围连续可调，电子能量发散半宽度上限为0．5eV。利用该阈值电离技术，我们实现了对N2／CO混合体系中二物种的选择电离及质谱检测。另外，对一些重要气体分子在阈值附近的相对电离截面进行了测定。

Abstract: The first electron beam bombarding ionizer with threshold ionization function in China was developed by us.The electron energy of the ionizer can be continuously changed from 8. d to 95 eV. The width limit of electron energy is about 0. 5eV. Using the ionizer,we have selective1y detected N2/CO and measured the relative cross-section of ionization of several species.