Characterization of Traveling Wave Ion Mobility Separations in Structures for Loss less Ion Manipulations

We report on the development and characterization of a traveling wave (TVV)-based Structures for Loss less Ion Manipulations (TW-SLIM) module for ion mobility separations (IMS). The TVV-SLIM module uses parallel arrays of rf electrodes on two closely spaced surfaces for ion confinement, where the rf electrodes are separated by arrays of short electrodes, and using these TVsTs can be created to drive ion motion. In this initial work, TVVs are created by the dynamic application of dc potentials. The capabilities of the TW-SLIM module for efficient ion confinement, lossless ion transport, and ion mobility separations at different rf and TVV parameters are reported. The TW-SLIM module is shown to transmit a wide mass range of ions (m/z 200-2500) utilizing a confining rf waveform (similar to 1 MHz and,300 Vp.p) and low TW amplitudes (<20 V). Additionally, the short TVV-SLIM module achieved resolutions comparable to existing commercially available low pressure 1MS platforms and an ion mobility peak capacity of similar to 32 for TW speeds of <210 m/s. TW-SLIM performance was characterized over a wide range of rf and TW parameters and demonstrated robust performance. The combined attributes of the flexible design and low voltage requirements for the TVVSLIM module provide a basis for devices capable of much higher resolution and more complex ion manipulations.