Lect13_notes

18 an energy dispersive x ray spectrum this is a plot

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Unformatted text preview: he x-ray spectrum generated within sample –  ZAF correction CBEMS 164 – XRD, SEM & Microanalysis: Lecture 13 ! 17 Spectrum Details! Excitation volume as increase kV from 10 to 15 for CuK$ CBEMS 164 – XRD, SEM & Microanalysis: Lecture 13 ! 18 An Energy Dispersive X-ray Spectrum! This is a plot of the number of x-ray photons collected within an energy window of (typically) 10 eV as a function of energy Number of counts depends on material, beam energy, probe current, and time CBEMS 164 – XRD, SEM & Microanalysis: Lecture 13 ! 19 The Process in Practice! •  Next we show what is done to obtain a quantitative analysis of a spot of material under a beam •  Position is identified by looking at SEM image and then stopping the beam at a point of interest –  The stationary spot strikes the sample and x-rays are produced CBEMS 164 – XRD, SEM & Microanalysis: Lecture 13 ! 20 An EDS Spectrum! •  Characteristic background •  Peaks for different elements –  Some elements hav...
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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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