A drift tube capable of simultaneously functioning as an ion funnel is demonstrated in proton transfer reaction mass spectrometry (PTR-MS) for the first time. The ion funnel enables a much higher proportion of ions to exit the drift tube and enter the mass spectrometer than would otherwise be the case. An increase in the detection sensitivity for volatile organic compounds of between one and two orders of magnitude is delivered, as demonstrated using several compounds. Other aspects of analytical performance explored in this study include the effective E/N and dynamic range over which the drift tube is operated. The dual purpose drift tube/ion funnel can be coupled to various types of mass spectrometer to increase the detection sensitivity and may therefore offer considerable benefits in PTR-MS work.3

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