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Title: 50 Years of Electron Biprism -50 Years of Exciting Electron Physics PDF
Url: https://www.jstage.jst.go.jp/article/ejssnt/2/0/2_0_52/_pdf
Creator: Lichte, Hannes
Publisher: Surface Science Society of Japan
Description: In 1953, Gottfried Moellenstedt invented the electron biprism, more or less by accident, with the serendipity characteristic to him: Aiming at dark-field imaging in an electron microscope, he stretched a thin tungsten wire across the objective aperture to block off the zero beam. However, instead of a dark field image, because of inadvertent charging of the wire under the beam, he found two images of the ZnO-needles serving as an object. Instead of trying the dark field imaging over and over again, he asked what the effect would be if the obtained two images were superimposed. Is coherence given? Moellenstedt, educated by Walther Kossel in diffraction of electron waves, had a vision: Together with his PhD-student Heinrich Dueker, he developed the electron biprism, consisting of a 1 micron m thin wire deliberately chargeable by means of a voltage source, as a beam splitter for coherent superposition of the electron waves passing the filament on the right and on the left. In 1955 they published the first results showing biprism interference fringes [G. Moellenstedt and H. Dueker, Naturwiss. 42, 41 (1955)], which, since then, gave access to the understanding of electron waves and their use for analysis of object structures up to atomic dimensions.



Target Audience: 2-4 Year College Faculty/Administrators
LC Classification: Science -- Physics -- Electricity and magnetism -- Electricity -- Physics of electrons, protons, and other particles
Science -- Physics -- Nuclear and particle physics. Atomic energy. Radioactivity -- Elementary particle physics -- Special nuclear and subnuclear particles, antiparticles, and families of particles, A-Z -- Electrons
Science -- Physics -- Optics. Light -- Physical optics -- Holography -- Electron holography
GEM Subject: Science -- Engineering
Vocational Education -- Trade and industrial
Key Concept: Physics -- Electrons
Resource Type: Reference Material
Format: Document -- PDF
Audience: Educator
Learner
Education Level: High School
Higher Education
Higher Education -- Undergraduate (Lower Division)
Higher Education -- Undergraduate (Upper Division)
Higher Education -- Technical Education (Upper Division)
Higher Education -- Technical Education (Lower Division)
Vocational/Professional Development Education
Language: English
Rights: The Surface Science Society of Japan
Access Rights: Free access
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Source Type: ATE Center
Source: National Center for Manufacturing Education
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