quadrupole spectrometer

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quadrupole spectrometer [′kwä·drə‚pōl spek′träm·əd·ər]

(analytical chemistry)

A type of mass spectroscope in which ions pass along a line of symmetry between four parallel cylindrical rods; an alternating potential superimposed on a steady potential between pairs of rods filters out all ions except those of a predetermined mass. Also known as Massenfilter.

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