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(a) Schematic configuration of an ion sponge with two layers of different sizes and (b) corresponding illustrations of the conceptual stability diagrams and pseudopotential well depths with the same RF applied on both layers. (c) Mass spectra obtained for DEET ions using an ion sponge with Geometry III for L1 and Geometry II for L2 with trapping rf amplitude of 115 V0-p, 175 V0-p, and 195 V0-p.
