The mass spectrometry of neutral species produced from mass-selected ions by collision and by charge exchange. Experiments with tandem collision gas cells

The neutralisation—reionisation mass spectra (NRMS) of a number of organic cations have been measured. Neutralisation was achieved by electron transfer from Xe atoms in the first of two collision cells in the second field-free region of a double focussing mass spectrometer of reversed geometry. Reionisation took place by collisional excitation with He atoms in the second cell; ions passing beyond the first cell were prevented from entering the …