1引言快原子轰击（FAB）是八十年代出现的一种软电离技术．质谱中采用这种电离方式，可以对一些低择性的极性物质和热不稳定物进行分析。由于FAn电离机理比较复杂，多年来成为人们一直探讨的对象。FAn质子化的谱与化学电离（CI）谱相仿，进一步的研究表明二者的电离机制是不同 1 Introduction Fast atom bombardment (FAB) is a soft ionization technique that emerged in the 1980s. This ionization method is used in mass spectrometry to analyze some less selective polar substances and thermal instability. Due to the complex mechanism of FAn ionization, it has been the object that people have been discussing for many years. The spectrum of FAn protonation is similar to that of chemical ionization (CI), and further studies show that the ionization mechanisms of both are different