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MATERIALS SCIENCE & ENGINEERING . Part of . A Learner’s Guide. AN INTRODUCTORY E-BOOK. Anandh Subramaniam & Kantesh Balani Materials Science and Engineering (MSE) Indian Institute of Technology, Kanpur- 208016 Email: anandh@iitk.ac.in, URL: home.iitk.ac.in/~anandh.

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slide1

MATERIALS SCIENCE

&

ENGINEERING

Part of

A Learner’s Guide

AN INTRODUCTORY E-BOOK

Anandh Subramaniam & Kantesh Balani

Materials Science and Engineering (MSE)

Indian Institute of Technology, Kanpur- 208016

Email:anandh@iitk.ac.in, URL:home.iitk.ac.in/~anandh

http://home.iitk.ac.in/~anandh/E-book.htm

slide2

Incoherent Scattering (Compton modified) From loosely bound charges

  • Incoherently scattered X-rays darken the background and are not useful from a XRD point of view
  • Here the particle picture of the electron & photon comes handy

Electron knocked aside

2

No fixed phase relation between the incident and scattered wavesIncoherent  does not contribute to diffraction

(Darkens the background of the diffraction patterns)

slide3

Fluorescent X-rays

  • This signal is produced akin to the way the original X-ray beam was produced; just that the input now is not electrons but X-rays

Knocked out electronfrom inner shell

Vacuum

Energylevels

Characteristic x-rays

(Fluorescent X-rays)

(10−16s later  seems like scattering!)

Nucleus