Abstract
IN an investigation of ion-molecule reactions in carbon dioxide in a magnetic sector mass spectrometer we observed the occurrence of a peak at m/e 88. By recording the ionization efficiency curve with the aid of an XY plotter, the curve shown in Fig. 1 was obtained. The break in the curve at about 38 eV is to be expected from the production of CO2+ by a charge exchange collision in the analyser portion of the instrument, that is, by the reaction: 
The portion of the curve above 38 eV follows the ionization cross-section curve obtained for CO2++ (m/e 22) in the same instrument.
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PAULSON, J., DALE, F. & MOSHER, R. Production of C2O4+ in an Ion-molecule Reaction. Nature 204, 377–378 (1964). https://doi.org/10.1038/204377a0
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DOI: https://doi.org/10.1038/204377a0
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