Ring electrodes during pathway

Fig. 2.11. Quadruple Ion traps provide a versatile approach for storage, fragmentation, and selection of ions, (a) Schematic of 3D quadmpole ion trap consisting of a ring electrode and two end-cap electrodes. Only one ion ejection pathway is shown. A combination of DC and RF potentials is applied to the electrodes. 1 mtorr of helium is typically added to the mass analyzer, (b) Schematic of a linear quadrupole ion trap. During ion trapping, DC and RF Ion-guiding potentials are maintained on the central electrodes while the end section electrodes maintain stop potential, SP.

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