| 摘要 |
An MS analysis is performed for each micro area within a specified mass analysis area on a sample. Based on the data obtained by this analysis, a distribution image of a specified m/z ratio of m/z range is created and displayed on a display screen (S10-S14). When an operator selects a substance of interest on the displayed image and indicates its m/z (S15), one or more micro areas in which the MS spectrum intensity at the specified m/z is equal to or higher than a threshold are extracted, and an MS/MS analysis using the m/z of the substance of interest as the precursor is performed on the extracted micro areas (S26 and S27). An average MS/MS spectrum is calculated from the MS/MS spectrum data obtained for those micro areas (S28), and the substance of interest is identified based on the information relating to the peaks appearing on the average MS/MS spectrum (S19).
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