| 摘要 |
A process condition parameter storage unit (51) for a control unit (50) is provided with a dwell time calculation table (51a) indicating the correspondence between CID gas pressure in a collision cell (31) and dwell time for data collection. In the table (51a), the dwell time increases with higher CID gas pressure. When execution of MRM measurement mode is instructed, the control unit (50) determines the dwell time according to the CID gas pressure at that time, and controls a data collecting unit (41) so as to integrate detection signals from an ion detector (34) during the dwell time and obtain an integrated value. When the CID gas pressure of the collision cell (31) is high, ion deceleration is conspicuous and the increase in ionic strength is slow, but when the dwell time is longer, the impact of the slow increase on the integrated value is relatively mitigated and the precision of the integratedvalue is improved. Thus, quantification precision can be improved. |
