Example geometries of select tandem-IM instruments.
(A) tandem DTIMS presented by Koeniger et al. [40] where ion packets can be transmitted, selected or activated in regions R1 and R2 (B) ion cyclotron presented by Merenbloom et al. [61] where ion packets of particular mobilities are selected for in regions R1–R4 (C) SUPER-SLIM presented by Deng et al. [43] where ion packets can be pushed to either travel through or bypass a serpentine IM track D) cyclic IM-QToF presented by Giles et al. [47] where ion packets can be stored and activated in regions R1 and R3, and introduced to the cyclic IM guide and activated in region R2.