Wien filter

<p>A Wien filter also known as a velocity selector is a device consisting of perpendicular <a href="/facts/Electric_field/tt4MooBs">electric</a> and <a href="/facts/Magnetic_field/Ta8Ev588">magnetic</a> fields that can be used as a <a href="/facts/Velocity_filter/7gsyctb8">velocity filter</a> for charged particles, for example in <a href="/facts/Electron_microscope/XtaBktwF">electron microscopes</a> and spectrometers. It is used in <a href="/facts/Accelerator_mass_spectrometry/kCoug2Um">accelerator mass spectrometry</a> to select particles based on their speed. The device is composed of <a href="/facts/Orthogonal/JVIjYPog">orthogonal</a> electric and magnetic fields, such that particles with the correct speed will be unaffected while other particles will be deflected. It is named for <a href="/facts/Wilhelm_Wien/Fm4W3S11">Wilhelm Wien</a> who developed it in 1898 for the study of <a href="/facts/Anode_rays/MhyobKLc">anode rays</a>. It can be configured as a charged particle energy analyzer, <a href="/facts/Monochromator/vagojlBb">monochromator</a>, or <a href="/facts/Mass_spectrometer/RH5WBHJ2">mass spectrometer</a>.
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Wien filter open-in-new

Wien filter