Discussion
Why must the sample make good contact with the crystal?
Answer: D
Because the wave decays within a micrometre or two, anything not touching the surface is simply not sampled and the spectrum is weak or absent. Scattering, refractive index and mechanical support are not the reason. A hard, irregular solid is the difficult case, which is why these accessories carry a pressure clamp - and why a poor spectrum from one is usually a contact problem rather than an instrument fault. The quantity that varies and the quantity that does not are worth naming before any substitution is attempted.
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