Mass spectrometer with method for real time removal of background signal
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United States of America Patent
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Feb 25, 2003
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Feb 25, 2000
filing date -
Feb 25, 2000
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Abstract
A mass spectrometer apparatus has one mass analyzer stage for selecting and rejecting ions having a particular mass-to-charge ratio and one fragmentation stage downstream from the first mass analysis stage for causing fragmentation of ions. Another mass analysis stage downstream from the fragmentation stage selects ions of a particular mass-to-charge ratio and rejects other ions. A synchronization unit is connected between the two mass analysis stages, for causing ions excited and removed in the one mass analysis stage to have the same mass-to-charge ratio as the ions selected by the other mass analysis stage, whereby ions detected by the detector are ions selected by the other mass analysis stage and generated by fragmentation in the fragmentation stage.
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