| 摘要 |
A method of operating an ion filter for selecting ions and related apparatus. The filter have a plurality of elongated electrodes, and the ions have a secular frequency. The method comprises exciting each elongated electrode with a first voltage component, the first voltage component having a first amplitude and a first frequency; exciting each elongated electrode with a second voltage component, the second voltage component having a frequency substantially equal to a secular frequency of motion for the ion; and generating an electric field and rotating the electric field around the axis.
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