| 摘要 |
A list including such information that enables acquisition of an MS n spectrum useful for component identification is stored in advance in a precursor ion list memory unit (33), the information indicating combinations of precursor ions for CIDs in respective stages. If an MS 1 spectrum on which CID is not performed is obtained during execution of an analysis, a precursor ion selector (32) determines whether or not an ion registered as a precursor ion for the first-stage CID exists on the MS 1 spectrum, based on the list held in the memory unit (33). If the ion exists, an MS 2 analysis in which the ion is set as a precursor ion is immediately executed. Subsequently, the precursor ion selector (32) determines whether or not an ion registered as a precursor ion for the second-stage CID in association with the precursor ion for the first-stage CID exists on an MS 2 spectrum. If the ion exists, an MS 3 analysis in which the ion is set as a precursor ion is immediately executed, so that an MS 3 spectrum is acquired. As a result, execution of an unnecessary MS 3 analysis based on an inappropriate combination of precursor ions can be avoided, and information useful for component identification can be efficiently collected. |
