Lect05_notes

cross over at d0 is demagnied and projected down the

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Unformatted text preview: cross-over is then projected and demagnified to form the probe that is incident on the surface of the specimen! ! !  CBEMS 164 – XRD, SEM & Microanalysis: Lecture 05 ! 14 W and LaB6 Filaments! !  !  Tungsten – simple hairpin akin to a light bulb filament! ! Current emitted at hairpin bend! ! Accelerated toward grounded grid cap! ! ! LaB6 – Crystal, ground to point, resistively heated! ! Low work function allows efficient formation of electron flux! ! Similarly accelerated towards grounded cap! ! CBEMS 164 – XRD, SEM & Microanalysis: Lecture 05 ! 15 CBEMS 164 – XRD, SEM & Microanalysis: Lecture 05 ! 16 Work Function! Self-Biased Thermionic Gun! !  Cross-over at D0 is demagnified and projected down the column to become the imaging probe! ! ! CBEMS 164 – XRD, SEM & Microanalysis: Lecture 05 ! 17 Self-Biased Thermionic Gun! !  Cross-over at D0 is demagnified and projected down the column to become the imaging probe! ! ! CBEMS 164 – XRD, SEM & Microanalysis: Lect...
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This note was uploaded on 01/16/2014 for the course CBEMS 164 taught by Professor Porter,j during the Fall '08 term at UC Irvine.

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