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Two-stage ion beam mass spectrometry I. The apparatus and its use to study the reaction of acetylium (CH3CO+) and nitronium (NO+2) ions with aromatic compounds in the gas phase

The construction of a two-stage ion beam mass spectrometer is described. Ions formed by electron impact are focused into a beam which enters a reaction vessel containing neutral molecules at a relatively high pressure. Secondary ions formed by reaction between the primary ion beam and neutral molecules are repelled out at right angles to the primary beam into a conventional magnetic analyser. The instrument was calibrated using the known Ar+ + Ar → Ar + Ar+ electron transfer reaction. It was then used to study the reaction of acetylium (CH3CO+) and nitronium (NO+2) ions with aromatic compounds. The principal secondary ions were those involving electron transfer from the aromatic nucleus, but in addition ions of the type C6H6NO+2 formed by addition of the primary ion to the aromatic compound were detected. However, the relative ‘yield’ of adduct ion from different aromatic compounds showed little correlation with the reactivity of these compounds towards acylation or nitration in solution.