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Type: Thingyago:WikicatParticleAcceleratorsyago:Accelerator102670382yago:Artifact100021939yago:Device103183080yago:Instrument103574816yago:Instrumentality103575240yago:Object100002684yago:PhysicalEntity100001930deviceyago:ScientificInstrument104147495yago:Whole100003553 New Facet based on Instances of this Class

A Wien filter also known as velocity selector is a device consisting of perpendicular electric and magnetic fields that can be used as a velocity filter for charged particles, for example in electron microscopes and spectrometers. It is used in accelerator mass spectrometry to select particles based on their speed. The device is composed of orthogonal electric and magnetic fields, such that particles with the correct speed will be unaffected while other particles will be deflected. It is named for Wilhelm Wien who developed it in 1898 for the study of anode rays. It can be configured as a charged particle energy analyzer, monochromator, or mass spectrometer.