Ion guide device and ion guide method

An ion guide method, comprising the steps of:

• providing a plurality of ring electrodes disposed in parallel, each of the ring electrodes includes at least 4 electrode units separated from each other, a channel for ion transmission is formed inside the plurality of ring electrodes, and an arrangement direction of the plurality of ring electrodes defines an axial direction of ion transmission;
• applying out-of-phase radio-frequency voltages on the neighboring electrode units belonging to the same ring electrode, and applying in-phase radio frequency voltages on the neighboring electrode units along the axial direction, thereby forming an radio-frequency multipole field distributed along the axial direction in a device;
• applying direct-current voltages to the plurality of ring electrodes, a direct-current voltage has a first direct-current component whose amplitude changing along the axial direction and a second direct-current component whose amplitude changing along a predetermined direction on a plane where a ring electrode is located;
• and
• transmitting ions off-axis and focusing the ions to a position closer to an inner surface of the ring electrode under a combined action of the radio-frequency voltages and the direct-current voltages.

An ion guide device, comprising:

• a plurality of ring electrodes disposed in parallel, each of the ring electrodes includes at least 4 electrode units separated from each other, a channel for ion transmission is formed inside the plurality of ring electrodes, and an arrangement direction of the plurality of ring electrodes defines an axial direction of ion transmission;
• an radio-frequency voltage source, for applying out-of-phase radio-frequency voltages on the neighboring electrode units belonging to the same ring electrode, and applying in-phase radio frequency voltages on the neighboring electrode units along the axial direction, thereby forming an radio-frequency multipole field that confine ions in the ion guide device;
• and
• a direct-current voltage source, which is used to apply direct-current voltages on the plurality of ring electrodes, a direct-current voltage has a second direct-current component whose amplitude changing along a predetermined direction on a plane where a ring electrode is located, so that the ions are deflected toward the electrode units directed in the predetermined direction,
• wherein central angles between the electrode units directed in the predetermined direction and the adjacent electrode units are both less than or equal to π/8.