如何看EI-MS质谱图

How to Interpret EI-MS Spectra

电子轰击源质谱(EI-MS)是质谱测定中经常使用、也是提供质谱结构信息最丰富的技术之一。面对一张完全未知化合物质谱图中的任意一个峰,能马上回答出是奇质量、偶质量、奇电荷、偶电荷峰,是分子峰、碎片峰、重排峰,含奇数氮、偶数氮(包括不含氮),含碳原子、硫原子、氯原子、溴原子数目等系列质谱结构信息,是质谱结构分析的基本功。

EI-MS is a frequently adopted technique which can provide rich information in compound structures. The following properties can be retrieved directly from the mass spectrum of an unknown compound, including the molecular or fragment ion peak, odd or even charge and mass, elemental numbers（C, N, Si, Cl, Br, etc.）. It is a basic skill to be able to acquire the aforementioned information from the mass spectrum.