| 摘要 |
A mass spectrometer comprising at least a first and second ion trap, T1 and T2, which are arranged in series. A relatively high AC or RF voltage is applied to the electrodes forming the first ion trap T1 in order to improve the trapping of energetic or high mass-to-charge ratio ions, and also having the effect of raising the low mass cut-off of the ion trap. Each subsequent ion trap in the series, downstream of T1, is arranged to have a lower low mass cut-off than the trap immediately upstream of it. As a result ions not trapped in the first ion trap T1 may be trapped in the second trap T2 or subsequent traps. Also disclosed is an ion trap ion source (see figure 7).
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