Ion trap operates in a pulsed mode so that ions are accumulated mass selectively over time. Collision-induced dissociation in the ion trap is produced by several hundred collisions of a mass-selected ion with helium buffer gas atoms. An advantage of ion-trap instruments is the ability to perform MSn.
In this technique an ion of interest is selected by ejecting all unwanted ions and the selected ion is subsequently fragmented by collision with a neutral gas. The resulting mass spectrum is called a daughter or product ion spectrum and it is a characteristic of the secondary fragmentation process. The mass range is 10 to 10,000 Da with a mass accuracy of ± 0.2 m/z.
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