{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

lect15_reel5_2pg - Crystal Structures X-ray Diffraction...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
1 Crystal Structures & X Crystal Structures & X- ray ray Diffraction Diffraction Chemistry 123 Spring 2008 Dr. Woodward Crystals Crystals
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
2 Crystalline Solids Crystalline Solids Crystal Lattice – A 3D array of points where each point has an identical environment. Unit Cell – The repeating unit (a unit cell is to a crystal, like a “brick” is in a house). In a given crystal all unit cells are identical. CaF CaF 2 Unit Cell Unit Cell 3D Crystal 3D Crystal Systems (7) Systems (7) Cubic Cubic Tetragonal Tetragonal Hexagonal Rhombohedral Rhombohedral Orthorhombic Monoclinic Monoclinic Triclinic Triclinic 14 14 Bravais Bravais Lattices Cubic The crystal systems each have distinctive symmetry and unit cell dimensions
Background image of page 2
3 X- ray Diffraction ray Diffraction Diffraction Demo Diffraction Demo Take home message The diffraction pattern is related but not equal to the grid pattern Diffraction is most effective for monochromatic light whose wavelength is similar to the spacing of “slits” For crystals X-rays have a wavelength comparable to spacings of atoms
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}