| 摘要 |
An ion trap analyzer, an ion trap mass spectrometry analysis method, and an ion fragmentation method are provided. The ion trap analyzer includes an ion trapping space enclosed by multiple electrodes (101, 102, 103, 11, 12, 214), where a high-frequency voltage is applied on at least a part of the electrodes, so as to generate, within the trapping space, a trapping electric field dominated by a quadratic field. The apparatus is provided with an ion ejection outlet (200) in at least one direction away from the center of the trap; an alternating voltage signal used for resonant excitation of ion motions is overlaid on an electrode part that is on a side of the ion ejection outlet and closest to the ejection outlet, while no voltage signal that is identical in range and phase with the alternating voltage is applied on at least one remaining electrode part in said direction. With the method, or by further applying, to the remaining electrode part in said direction, a voltage signal that is inverted to the alternating voltage, the orientation of an alternating electric field induced by the excitation alternating voltage signal can be limited, thereby improving the resonance ejection efficiency of the ion trap, reducing, in ion motions, motion coupling between an ejection direction and a non-ejection direction, and improving the viability of selecting the ion trap as a mass analyzer. |
| 主权项 |
1. An ion trap analyzer, comprising:
multiple confining electrodes, an ion trapping space enclosed by the multiple confining electrodes, a voltage source configured to apply a trapping voltage to at least one confining electrode of the multiple confining electrodes, so as to generate a trapping electric field in the ion trapping space, at least one ion ejection outlet provided on a side of the ion trapping space, the ion ejection outlet defining an ion ejection direction, and an excitation voltage source, wherein confining electrodes on the same side of the ion trapping space as the ion ejection outlet are divided into multiple electrode parts in a direction perpendicular to the ion ejection direction, wherein the voltage source is further configured to overlay at least one of in-phase alternating trapping voltages or DC trapping voltages on the multiple electrode parts so as to form a substantially quadratic trapping electric field in the ion ejection direction, and wherein the excitation voltage source is configured to overlay an alternating voltage signal whose amplitude is less than or equal to a maximum absolute value of the trapping voltage on a first electrode part of the multiple electrode parts, the first electrode part being adjacent to the ion ejection outlet, so as to select a motion range of ions by means of resonant excitation, and such that no voltage signal having the same phase as said alternating voltage signal is applied on a second electrode part of the multiple electrode parts except the first electrode part, and wherein the excitation voltage source is further configured to overlay an alternating voltage signal inverted to the alternating voltage signal on the second electrode part. |
