Discussion
Why does a potassium bromide pellet often show a hydroxyl band?
Answer: D
Potassium bromide is hygroscopic, so unless it is dried and handled quickly it takes up moisture and the water's own broad band near 3400 appears. Decomposition, intrinsic absorption and die contamination are not the usual cause. Knowing that a particular preparation technique introduces a particular artefact is what prevents that artefact being reported as a structural feature.
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