Methods and apparatus for mass spectrometry

Details Methods and apparatus for mass spectrometry Methods and apparatus for mass spectrometry

H - Electricity

01

J

H01J 49/26 (2006.01)

Patent

CA 2350041

A method is disclosed of identifying parent ions by matching daughter ions found to be produced at substantially the same time that the parent ions elute from a mixture. Ions emitted from an ion source 1 are incident upon a collision cell 3 which alternately and repeatedly switches between a first mode wherein the ions are substantially fragmented to produce daughter ions and a second mode wherein the ions are not substantially fragmented. Mass spectra are taken in both modes, and at the end of an experimental run parent and daughter ions are recognised by comparing the mass spectra obtained in the two different modes. Daughter ions are matched to particular parent ions on the basis of the closeness of fit of their elution times, and this enables parent ions to then be identified.

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