| 摘要 |
The invention relates to a tandem mass spectrometer and a method for scanning daughter ion spectra which uses a quadrupole mass spectrometer for selection of parent ions and another one for the measurement of the daughter ions. The invention consists of not using a conventional third quadrupole filter as a collision cell for fragmentation of the parent ions but an ion guide system with helically coiled wires, especially in the form of a double helix, in which the ions can be completely decelerated and can be actively fed to the outlet aperture.
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