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R.T. Jones, Newport News, Mar 21, 2002

Effects of Crystal Quality on Beam Intensity. The graph at right shows how the width of a diamond’s Bragg peak affects the intensity of the x-ray beam. Each curve represents a crystal with a different Bragg peak width. R.T. Jones, Newport News, Mar 21, 2002. Stone 1407 slice 1.

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R.T. Jones, Newport News, Mar 21, 2002

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  1. Effects of Crystal Quality on Beam Intensity The graph at right shows how the width of a diamond’s Bragg peak affects the intensity of the x-ray beam. Each curve represents a crystal with a different Bragg peak width. R.T. Jones, Newport News, Mar 21, 2002

  2. Stone 1407 slice 1 4mm x 4mm X-ray beam rocking curve 2mm R.T. Jones, Newport News, Mar 21, 2002

  3. A diamond ingot slice 1 slice 2 slice 3 seed We brought samples from 3 ingots to Daresbury January 2002 • Stone 1407 • Stone 1485A • Stone 1532 R.T. Jones, Newport News, Mar 21, 2002

  4. Stone 1482A slice 1 3mm x 5mm X-ray beam rocking curve 2mm R.T. Jones, Newport News, Mar 21, 2002

  5. A diamond crystal can be divided up into its most basic components, called unit cells. Each unit cell has eight carbon atoms. The atoms of the unit cells together make up many sets of parallel planes, and Bragg scattering can occur on any set of parallel planes. The Bragg angle depends on the spacing between the planes and the wavelength of the incoming light. The set of planes we scattered from is denoted by the vector (0,0,4). For this set of planes, QBragg = 34.2° Image from Elements of X-Ray Diffraction, B. D. Cullity, Addison-Wesley 1967

  6. Schematic of Bragg Intensity Peak Measurements Condition for Bragg scattering: Bragg-scattered x-rays X-ray detector l=2dsin Q Diamond wafer, with lattice spacing d Q l Q Incoming x-rays from radiation source

  7. Condition for Bragg scattering: l=2dsin Q Incoming x-ray l l Q Q d Diamond atoms

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