Discussion
Why does a sloping baseline suggest scattering?
Answer: D
Particles scatter more strongly at shorter wavelengths, so a poorly ground solid gives a baseline that rises steadily towards high wavenumber. Detector drift and source variation divide out in the background ratio, and decomposition would change the bands rather than the baseline. Grinding the sample more finely is the remedy, and recognising the tilt as a preparation fault rather than a sample property is what prompts it.
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