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Reason for using X-ray to determine internuclear distance

littleboy
in Chemistry

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From the book,i know that X-ray is used to determine internuclear distance between atoms in a compound(or element) because wavelength of X-ray is similar to the internuclear distance between 2 atoms.But my question is that:what is the relationship between the nearness and its use to determine the internuclear distance?

For diffraction and interference to be helpful, you need something with a wavelength of the same order as the spacing of the structure you are investigating.

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