Identification and Determination of the Molecular Structure of Phosphate Esters by the Joint Application of Positive Ion and Negative Ion Electron Ionization Mass Spectrometry

The decay paths of negative molecular ions of phosphate esters, formed under the conditions of resonance electron capture, are of the same type and, therefore, predictable. A combination of mass spectra of the studied substances obtained by this method with the mass spectra of positive ions recorded in the convential electron ionization mode significantly expands the possibilities of their identification and determination of the characteristics of their molecular structures. In this case, only one mass spectrometer can be used, quickly switched from one mode to another.