Tandem mass spectrometer with synchronized rf fields

Details Tandem mass spectrometer with synchronized rf fields Tandem mass spectrometer with synchronized rf fields

H - Electricity

01

J

358/9

H01J 49/36 (2006.01) H01J 49/42 (2006.01)

Patent

CA 1134957

ABSTRACT OF THE DISCLOSURE A tandem quadrupole mass spectrometer system having first, second and third quadrupole sections close coupled in series with one another. Ac-only is applied to the centre section and con- ventional AC and DC voltages are applied to the two end sections. The AC applied to all three sections is synchronized in frequency. The AC phase shift between each section is of magnitude between 0 and 0.1 cycles in absolute value, pre- ferably between 0 and 0.03 cycles in absolute value, and in the preferred embodiment the AC phase shift between each section is essentially zero. The sections are spaced apart longitudinally by a very short distance not exceeding r0, the radius of the inscribed circle within the quadrupole rods.

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