| Bragg's Law |
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When X-rays ''hit'' an atom, they make the Electronic Cloud move as does any Electromagnetic Wave . The movement of these charges re-radiate waves with the same Frequency (blurred slightly due to a variety of effects); this phenomenon is known as the Rayleigh Scattering (or elastic scattering). These re-emitted X-rays interfere, giving constructive or destructive Interference s; this is the diffraction phenomenon. The interference is constructive when the phase shift is proportional to 2π; this condition can be expressed by Bragg's law: where
''According to the 2θ deviation, the phase shift causes constructive (left figure) or destructive (right figure) interferences'' Note that moving particles, including Electrons , Protons and Neutrons , have an associated Wavelength , as determined by Louis De Broglie (see De Broglie Wavelength ). SEE ALSO |
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