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The composition of various mixtures of isomeric gaseous C 7 H 9+ ions, generated from four different C 7 H 8 precursors by CI(methane) and CI(isobutane) and by EI-induced fragmentation of two monoterpenes, α-pinene (5) and limonene (6), in the external ion source of an FT-ICR mass spectrometer, has been detected by means of proton transfer reactions to selected...
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