Storage bank for ions
The invention relates to instruments for storing ions in more than one ion storage device and to the use of the storage bank thus created. The ion storage bank includes several storage cells configured as RF multipole rod systems, where the cells contain damping gas and are arranged in parallel. Each pair of pole rods is used jointly by two immediately adjacent storage cells such that the ions collected can be transported from one storage cell to the next by briefly applying DC or AC voltages to individual pairs of pole rods. The ions can thus be transported to storage cells in which they are fragmented or reactively modified, or from which they can be fed to other spectrometers. In particular, a circular arrangement of the storage cells on a virtual cylindrical surface makes it possible to accumulatively fill the storage cells with ions of specific fractions from temporally sequenced separation runs.
1. An ion storage bank, comprising: storage cells, wherein the storage cells take the form of RF multipole rod systems and are arranged in parallel, adjacent storage cells each sharing one pair of pole rods, and a voltage generator can supply a common DC or AC pulse to the two pole rods of a shared pole rod pair to drive stored ions into an adjacent storage cell.
2. The ion storage bank of claim 1 , wherein the storage cells are arranged in parallel in a single plane.
3. The ion storage bank of claim 1 , wherein the storage cells are arranged in parallel in an open or closed circular chain of cells.
4. The ion storage bank of claim 1 , wherein the pole rods of the storage cells each form a quadrupole rod system.
5. The ion storage bank of claim 4 , wherein an electric voltage supply is available which supplies every third pair of pole rods with the same DC and RF voltages.
6. The ion storage bank of claim 5 , wherein an RF transformer with three secondary windings, each with center taps, is used to connect the pole rods, and DC or RF voltage pulses can be superimposed on each of the three RE voltages via the center taps.
7. The ion storage bank of claim 1 , wherein the pole rods of the storage cells each form a hexapole rod system.
8. The ion storage bank of claim 1 , wherein the storage cells are filled with a damping gas at a pressure of between 10 −3 and 10 +2 Pascal.
9. The ion storage bank of claim 1 , wherein it contains a receiving storage cell and a delivering storage cell.
10. The ion storage bank of claim 1 , wherein at least one of the storage cells is equipped with devices to fragment the stored ions.
11. The ion storage bank of claim 1 , wherein at least one of the storage cells is equipped with devices to reactively modify the stored ions.
12. The use of an ion storage bank of claim 1 for accumulative storage of ions of the same separation fraction which originate from a separation process carried out repeatedly.
13. The use of an ion storage bank of claim 1 for the separation of the ions according to masses by decreasing the voltages of the DC pulses during repeated transport into neighboring cells.
14. The use of an ion storage bank of claim 1 for the separation of ions of approximately the same mass according to their mobility by increasing the voltages of the DC pulses during repeated transport into neighboring cells.
15. An ion storage bank, comprising:
a plurality of parallel storage cells each containing damping gas, where each of the plurality of parallel storage cells includes an RF multipole rod system and immediately adjacent storage cells share a pair of pole rods; and
a voltage generator that supplies an electric pulse to the pair of pole rods of the shared pole rod pair to drive stored ions into an immediately adjacent storage cell.
16. An ion storage and analysis system that receives ions from an ion source, comprising:
an ion storage bank that receives and stores the ions, where the storage bank comprises a plurality of parallel storage cells each containing damping gas, where each of the plurality of parallel storage cells includes an RF multipole rod system and immediately adjacent storage cells share a pair of pole rods;
a controller that supplies an electric pulse to the pair of pole rods of the shared pole rod pair to drive stored ions into an immediately adjacent storage cell; and
a mass spectrometer that receives stored ions from the ion storage bank.