| 摘要 |
The settling time of the output voltage of a high voltage power supply (20) for applying a high voltage to a nozzle of an ESI probe (5) becomes longer when voltage is switched to a falling direction within the same polarity. To address this problem, in a mass spectrometer according to the present invention, when it is necessary to carry out MRM measurement for a plurality of MRM transitions during a single cycle, a measurement order rearrangement unit (34) rearranges a measurement order and determines an analysis sequence so that the absolute value of the optimal applied voltage (applied voltage having the best ionization efficiency) for the nozzle of the ESI probe (5) increases from the smallest value. An analysis control unit (31) controls the high voltage power supply (20) and other parts according to the determined analysis sequence and carries out analysis. Because the voltage applied to the nozzle is not switched so as to fall within the same polarity during a single cycle, the cycle time is shortened compared to that of conventional devices, and it is possible to increase the number of data points per unit time and enhance mass chromatogram peak shape accuracy. |
