= Quadrupole mass analyser in IUPAC Gold Book
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https://goldbook.iupac.org/terms/view/Q04971/plain
Official terminology entry Q04971, DOI 10.1351/goldbook.Q04971. Primary definition: selected mass/charge follows stable trajectories in combined static and high-frequency quadrupole electric fields; other values have unstable trajectories. Indexed primary plain/PDF record verified; interactive HTML fetch unavailable. Cites IUPAC Recommendations 1991, PAC 63, 1541, definition on page 1545. No quantitative transmission or resolution claim.
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