Bragg%20Diffraction

1
Bragg Diffraction

• Light waves incident on a crystal
• (at grazing angle q) reflect from multiple
  atomic planes
• The path difference of the reflected waves is
• 2dsinq , where d is the spacing between planes
• Constructive interference occurs when the path
  difference equals an integer multiple of the
  incident
• wavelength

Bragg Equation 2dsinq nl
2
Bragg Diffraction
d100 maxima
d110 maximum
d210 maximum
Lattice Spacing (cm) Lattice Spacing (cm) Lattice Spacing (cm)
Plane calc actual
(100) 4.03 3.80
(110) 2.62 2.70
(210) 1.74 1.70
3
Bragg Diffraction
Lattice Spacing
4.48 cm