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If the wavelength of the x-ray source is 1.54 Angstroms, and the range of incident angles...

If the wavelength of the x-ray source is 1.54 Angstroms, and the range of incident angles is limited to 2 – 70 degrees, what is the maximum and minimum crystal plane spacing that can be measured?

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Answer #1

The only interplanar distance can be calculated using Bragg's law. Bragg's law for first order diffraction is

The maximum interplanar distance is when the denominator is minimum

The minimum interplanar distance is when the denominator is maximum. The maximum denominator is when the angle is maximum. So we get

These are the maximum and minimum interplanar distance.

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