Chromatograph mass spectrometer

A chromatograph mass spectrometer for temporally separating a plurality of target components contained in a sample and performing selective ion monitoring measurement and/or multiple reaction monitoring measurement on each of the target components under one or more measurement conditions, the chromatograph mass spectrometer comprising:

• a) a memory for previously storing measurement conditions created for each of the target components, the measurement conditions including an SIM measurement ion which is an ion measured in the selective ion monitoring measurement or an MRM transition which is a pair of precursor and product ions used in the multiple reaction monitoring measurement, an execution time period of the measurement conditions, and an initial dwell time which is an initial value of an execution time of one measurement;
• b) a measurement time divider for dividing an entire measurement time from a start to an end of the measurement of the sample into a plurality of partial time periods having different combinations of the selective ion monitoring measurement and/or the multiple reaction monitoring measurement executed in a same time period;
• c) a time period input receiver for receiving an input by a user for selecting one of the partial time periods;
• d) a sensitivity information input receiver for receiving an input of sensitivity information relating to measurement conditions executed in the selected partial time period;
• e) a dwell time calculator for calculating a changed dwell time by increasing or reducing the initial dwell time according to details of the input of the sensitivity information;
• and
• f) a loop time calculator for calculating a loop time from the changed dwell time and outputting the calculated loop time.