Bragg Diffraction 2dsinq = nl Bragg Equation

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Presentation transcript:

Bragg Diffraction 2dsinq = nl Bragg Equation 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

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

Bragg Diffraction Lattice Spacing 4.48 cm