| 摘要 |
<p>Provided is a quadrupole mass spectrometer including direct-current voltage sources (62, 63) having response characteristics which ensure that the response time of the direct-current voltage will be shorter than the period of time required for an ion having the highest mass-to-charge ratio (m/z) among the ions introduced into a quadruple mass filter (2) to pass through this filter (2). Main rod electrodes (31-34) and pre-rod electrodes (41-44) are connected to each other via primary differentiation circuits (65, 66). Thus, in the transient state of the voltage change due to the switching of the mass-to-charge ratio, among the ions entering the quadrupole mass filter (2), ions having low m/z values can be removed by a pre-electrode unit (4), and ions having high m/z values can be removed by a main electrode unit (3). Accordingly, a large amount of ions can be prevented from passing through the filter (2) and entering an ion detector (5).</p> |
