[PAR] [TLE] Wien filter [SEP] 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. [PAR] [TLE] Wilhelm Wien [SEP] Wilhelm Carl Werner Otto Fritz Franz Wien (] ; 13 January 1864 – 30 August 1928) was a German physicist who, in 1893, used theories about heat and electromagnetism to deduce Wien's displacement law, which calculates the emission of a blackbody at any temperature from the emission at any one reference temperature.
[PAR] [TLE] Wien filter [ SEP ] 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 . [PAR] [TLE] Wilhelm Wien [ SEP ] Wilhelm Carl Werner Otto Fritz Franz Wien ( ] ; 13 January 1864 – 30 August 1928 ) was a German physicist who , in 1893 , used theories about heat and electromagnetism to deduce Wien 's displacement law , which calculates the emission of a blackbody at any temperature from the emission at any one reference temperature .
What nationality was the scientist who developed the Wein filter ?
What nationality was the scientist who developed the Wein filter ?
German
German