| 摘要 |
<p>After various ions are trapped in an ion trap (1), a wide-band voltage having a notch with a predetermined frequency width is applied between end cap electrodes (12, 13) to remove ions having relatively large differences of mass from that of the target ions in a short time. After this removal, the target ions and ions having masses near the mass of the target ions are left in the ion trap (1). Unwanted ions of each species not removed in the previous processing are treated as target ions and removed by applying a sinusoidal wave voltage corresponding to each species between the end cap electrodes (12, 13). Thus, only the target ions are finally left in the ion trap (1). By cleaving, product ions are produced and subjected to mass spectroscopy. In such a way, the target ions can be quickly selected with high accuracy and resolution.</p> |
