Another question on X-ray Diffraction

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Another question on X-ray Diffraction

Post by charithjperera » Sun Jun 22, 2008 11:01 am

Hi Joe,

I know X-ray Diffraction is called Diffraction, but from what I have seen like the wave gets scattered off the atoms and not diffracted.

I have not seen diffraction send light back like in x-ray diffraction, I have only seen it let light pass through but have a bending effect on it.


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Post by joe » Sun Jun 22, 2008 12:19 pm

The distinction between interference and diffraction is quantitative rather than qualitative.

Young's experiment (2 slits) is called interference. A similar experiment with say 5 slits would be called interference.

A diffraction grating might have a million 'slits' (lines), of which perhaps thousands might be used in the experiment. But this is called diffraction (whether the beam passes through or comes back from the grating).

A single slit produces a pattern that is analysed by dividing the slit up into a very large number of sources displaced across the slit. This is called diffraction.

An x-ray beam interacts with very many planes in a crystal. it is called diffraction.


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