Ring electrode stacked

Waters introdnced a stacked-ring RF ion-transmission device (the MassTransit ion tutmel), replacing the RF-only hexapoles [43]. The device consists of a series of constant-apertnre and eqttally-spaced ring electrodes. An RF voltage is applied with 180° phase shift to adjacent plates, generating a field that constrains the ions to the centre region of the device. 60-80% improved ion transmission was observed. 

FIGURE 22.2 Photographs of the IT-SIMS instrument based on the Teledyne ion trap. (A) Vacuum unit situated on top of a cart, next to a monitor. Pumping, electronics, and computer are shown below the cart platform. (B) Top view (glass cover removed). The perrhenate ion gun is the lens stack on the left side, the curved channeltron is in the center, and the end caps and ring electrode are on the far right side. The small ruler on the edge of the vacuum chamber is 15 cm. 

As the ion funnels are made of stacked ring electrodes, in both of the funnels efficient pumping is expected between the electrodes. Due to the adiabatic expansion through the orifice between the two pressure stages the expanded gas cools down, and this gas jet tends to conserve its integrity for a relatively long time (and distance) in the second ion funnel. It does not easily dissipate—despite the efficient pumping. This cold gas jet enables the measurement of ion mobility in the ion funnel with a sufficient resolution. 

Note A specific type of IM-MS instrumentation using a traveling-wave (T-wave ) approach is available from Waters. In a T-wave ion mobility device ions are pushed by low-voltage waves established along a large stack of paired ring electrodes. However, the theory of ion mobility separation in the T-wave is not as fully understood as in traditional IMS devices [236,241]. 

The ion optics stage may be equipped with lenses—for example, an RF-only quadrupole (hexapole, octopole) or other elements such as a stack of ring electrodes connected to an RF power supply that generates a traveling wave of ions." ... 

Another type of polymeric structure is based macrocyclics or on stacks of macro-cyclic units. An exhaustive electrodynamic investigation of the polymer derived from yU.-oxo-(tetra-ferf-butylphthalocyaninato)germanium and of the monomer was carried out using CPE, CV, voltammetry by RDE, rotating ring-disk electrode and differential pulse... 

---