| 摘要 |
In the ion storage device 10 according to the present invention, an LC resonant circuit 40 for generating an RF voltage for trapping ions is connected to at least one of the electrodes 11, 12 and 13 surrounding the ion storing space 14. The LC resonant circuit 40 includes switching devices 46, 47 and resistances 48, 49 for stopping the RF voltage when the ions stored in the ion storing space 14 are ejected. The inductance L, the capacitance C and the resistance R of the LC resonant circuit are set to substantially satisfy the critical damping condition, which means that R=X/2 where X=omega0L=(omega0C)-1. According to this configuration, the RF voltage damps fast when the RF voltage is stopped by the switching devices 46, 47, and the deterioration of the mass resolution of the mass analyzer or the peak shift in the mass spectrum is prevented.
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