Importance

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Abstract

In a tandem mass spectrometer ions are created only once and stored in an ion reservoir. A particular ion species to be analyzed is then exported from the reservoir through a mass selective ion gate without damaging the other ion species remaining in the reservoir. All subsequent analyses are conducted on these stored ions, without adding further ions so that no changes in the concentrations of the stored ion species occur. The exported ions are fragmented, and a fragment ion mass spectrum is measured in a mass analyzer, preferably in a time-of-flight mass analyzer with orthogonal ion injection. The processes of exporting a selected ion species with subsequent fragmentation and the acquisition of the fragment ion spectrum can be repeated for any number of ion species stored in the reservoir.

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First Claim