Source of Elctron in Electron Microscope | Swansea University - Edubirdie

University:
Swansea University
Course:
PM134 | Microbiology
Academic year:

2023
Views:

450

Pages:

2
Author:

Sanjeev KG

Electron Source An & soverce consists of Cathode and an anode. Cathode is a being heated tungsten filament which emits is when The te cag & confine, the electrons into a loosely focusse beam. The beam is accelerated towcorde the specimen by the mode Electrons at the rim of the beam falu onto the anode while other pass through the small hole of anode Working Electromagnete Lens System - After leaving the & source, the & beam is tightly Joussed using electromagnete lene and metal apertion. The Syrton allows only Es with in small energy to pass through so the es in electron beam will have a well defined energy. 1 Magnetx lens Circulas electro magnets capable of generating a treen ircular mag. field. The field acts like an optical lene to fous the Es.

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