Abstract
In the present work we describe the principles of operation, versatility and applicability of a trapped ion mobility spectrometer (TIMS) analyzer for fast, gas-phase separation of molecular ions based on their size-to-charge ratio. Mobility-based separation using a TIMS device is shown for a series for isobar pairs. In a TIMS device, mobility resolution depends on the bath gas velocity and analysis scan speed, with the particularity that the mobility separation can be easily tuned from low to high resolution (R>50) in accordance with the analytical challenge. In contrast to traditional drift tube IMS analyzer, a TIMS device can be easily integrated in a mass spectrometer without a noticeable loss in ion transmission or sensitivity, thus providing a powerful separation platform prior to mass analysis.
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