| 摘要 |
<p>Ions having a restricted range of mass to charge ratios are transmitted to the acceleration region of a Time of Flight mass analyser. A control system applies a first extraction pulse to an acceleration electrode in order to accelerate a first group of ions into the time of flight region at a first time T1, wherein ions having the lowest mass to charge ratio in the first group of ions have a time of flight DeltaT1min through the time of flight region and ions having the highest mass to charge ratio in the first group of ions have a time of flight DeltaT1max through the time of flight region. The control system applies a second extraction pulse to the acceleration electrode at a subsequent second time T2, wherein DeltaT1max-DeltaT1min@T2-T1<DeltaT1max.</p> |
