引言电子倍增管是一种极灵敏的离子探测器,三十年代末期已用于质谱计中,以提高灵敏度。电子倍增管可以作到具有高的放大倍数;低噪声;对空气稳定;直接接收离子等优点,已得到广泛的运用。电子倍增管用于质谱计中,就使用而言,可分为“直流”和“脉冲”两种方法。直流使用即被探测的离子,通过电子倍增管转变成电 Introduction Electron multiplier tube is a very sensitive ion detector, the late 1930s has been used in mass spectrometry in order to improve the sensitivity. Electron multiplier tube can be made with a high magnification; low noise; stable to air; directly receive ions, etc., has been widely used. Electron multiplier tubes are used in mass spectrometers. For their use, they can be divided into two types: “direct current” and “pulse”. DC uses the ions to be detected and is converted into electricity by an electron multiplier