Lect12_notes

Cbems 164 xrd sem microanalysis lecture 12 8 consider

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Unformatted text preview: (Bremsstrahlung) Radiation – Stochastic Deceleration! CBEMS 164 – XRD, SEM & Microanalysis: Lecture 12 ! 6 Intensity of White Radiation! CBEMS 164 – XRD, SEM & Microanalysis: Lecture 12 ! 7 The X-Ray Signal (EDS)! •  A beam electron ejects an inner shell electron from an atom •  An outer shell electron drops down into the inner shell –  It has to release some energy –  It ejects an x-ray photon –  The energy (wavelength) of the ejected photon is characteristic of the atomic number of the excited atom •  Energy dispersive x-ray microanalysis become possible. CBEMS 164 – XRD, SEM & Microanalysis: Lecture 12 ! 8 Consider an Atom in the Sample! •  High energy electron impinges on an atom •  Inner shell electron ejected –  Becomes SE electron –  (Also outer shell electrons) •  Outer shell electron drops down into vacated electron position –  Energy is released as an xray photon or Auger electron CBEMS 164 – XRD, SEM & Microanalysis: Lecture 12 ! 9 CBEMS 164 – XRD, SEM & Microanalysis: Lecture 12 ! 10 X-Ray Peaks! Henry Moseley! Henry Gwyn-Jeffreys Moseley (23 November 1887 to 10 Augus...
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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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