| 摘要 |
A mass spectrometer is provided with a function that sequentially performs MS analysis of sample components separated by a column of a chromatograph and automatically determines a timing to perform MS/MS analysis based on the MS analysis results. The mass spectrometer includes chromatogram creation means for creating a chromatogram showing changes over time in an ion intensity within a predetermined mass range based on the MS analysis results, and timing determination means for determining a timing to perform MS/MS analysis based on the chromatogram. The timing determination means determines , as a timing to perform MS/MS analysis, a point in time at which a signal intensity in the chromatogram reaches a predetermined upper limit after exceeding a predetermined lower limit or a point in time at which a signal intensity in the chromatogram reaches a top of a peak without reaching the upper limit after exceeding the lower limit. It is thus possible to collect precursor ions at a timing at which the signal intensity of a peak originating from sample components is highest between the upper limit and lower limit, and thereby obtain a high quality MS/MS spectrum. |
