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In X-ray diffraction (XRD) pattern we use X-ray because it has the wavelength of the same order as that of the inter-planar separation. Now if instead of X-rays I use laser light, then how it will affect the XRD pattern?

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    $\begingroup$ Assuming you mean a visible light laser, there will be no diffraction. The spacing between scatterers is less than a wavelength so there is no diffraction. (Alternatively, you can say that there is only zero-order diffraction.) $\endgroup$
    – garyp
    Commented Jul 16, 2021 at 11:23
  • $\begingroup$ Just here to point out that above comment is right in almost all cases. The case in which there will be some measurable XRD-like diffraction for visible light is synthetic opals. Silica balls which form those opals are of same order of size as a visible light wavelength, so the gist of argument holds. $\endgroup$ Commented Jul 16, 2021 at 19:11

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