Insertion of an LC single-stage notch filter (of the shunt variety) between the output of a quadrupole mass spectrometer and a fast current amplifier greatly attenuates the rf noise typically present on the signal output. The 2.5-MHz rf was significantly reduced with negligible interference of the 1-μs resolved time of flight (TOF) work. Also presented is the fast current amplifier design.
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Marsh et al. (1989) studied this question.
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