Ion—Molecule Assiciation Reactions in Quatrupole Mass Spectrometry Ⅰ.Quadrupole Mass Spectrometry of Aromatic Acids and Their Derivatives

The mass spectra of sixty samples of aromatic acids and their derivatives with different types of structures were determined under DEP condition by using Finnigan-MAT 4510 model mass spectrometer. It is observed that the adduct ions such as M+ArCO~+ and M+Ar~+ were produced by some species. In this paper, the conditions, regularity and mechanism of the ion-molecule association reactions have been explored in detail, and the significance of the reaction is also described.