| 摘要 |
A method for filtering ions having a selected mass-to-charge ratio is set forth. In accordance with the method, one or more ions are injected into ion inlets of first and second ion selection chambers in a generally concurrent manner. The first and second ion selection chambers each have a corresponding ion outlet. The first ion selection chamber has a first plurality of electrodes disposed between the respective ion inlet and ion outlet and the said second ion selection chamber has a second plurality of electrodes disposed between its respective ion inlet and ion outlet. One or more RF signals are applied to the first and second plurality of electrodes to generate a rotating electric field respectively in each of the first and second ion selection chambers. Ions exiting the ion outlets of the first and second ion selection chambers, for example, to generate a mass spectrum for the injected ions.
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