| 摘要 |
A method of mass spectrometry is disclosed comprising performing a plurality of experimental runs, wherein each experimental run comprises: periodically mass analysing fragment or product ions at a plurality of time intervals, wherein a delay time is provided between the start of the experimental run and the first time interval at which the fragment or product ions are mass analysed. Different delay times are provided in different ones of the experimental runs and fragment or product ions that have been analysed in a first time interval and another time interval in another experimental run is identified as a fragment or product ions of interest. The timings of the first time interval and/or the other time interval is used to identify the respective precursor of the product or fragment ion of interest. Mass spectra obtained for different time intervals can be summed and the peak centroids of the summed mass spectra that correlate with product/fragment ions can be used to identify its respective precursor ion. |
