Magnetic lenses - PowerPoint PPT Presentation
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Magnetic lenses
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Methods and Tehniques in Surface Science Prof. Dumitru LUCA Alexandru Ion Cuza University, Iasi, Romania UHV systems Echipaments for UHV Vapor pressure for ... – PowerPoint PPT presentation
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Title: Magnetic lenses
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Magnetic lenses
Focussing the charged particle beam in the
magnetic field Up all the particules entering
in A are focussed in C. Down An example of a
magnetic lens
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Dispersive elements. Cylindrical sectors analyzer
Cylindrical sectors analyzer (?max118.6? -
Herzog aperture)
Biasing circuit
The outer cylinder, negatively biased, repels the
electronis, thus ensuring their energy-dependent
dispersion. Electrons with a certain energy are
selected via bias browsing.
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Hemispheric analyzer
Capacitors system (4 plates) For surface scanning
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Cylindrical mirror analyzer (CMA)
