A prototype gas chromatograph (GC) electron monochromator (EM) reflectron time-of-flight (TOF) mass spectrometer has been constructed and demonstrated to simultaneously record four-dimensional resonant electron capture (REC) mass spectra (m/z, ion-intensity, electron-energy, and retention time) of electron-capturing compounds in real time. Specifically, complete REC mass spectra of all of the components in a mixture of perfluorocarboxylic acids and in a sample of pentafluorobenzyl alcohol were recorded in the GC mode. For each compound, the data enable one to distinguish different electronic states of the molecular ion and different possible decomposition pathways for each state. This new instrument can be used to obtain analytical information unrecognizable by any other mass spectrometric technique from the isomeric species of a variety of electron-capturing structures.

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