Notes on the Preparation of Reststrahlen Plates and the Reflection Power of Powders

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Abstract
Reststrahlen plates were prepared (1) of natural crystal surfaces, (2) of surfaces of fused and then recrystallized substances, and (3) of pressed crystal powders. The reststrahlen resulting from reflection upon these three types of surfaces were compared. The wave-length of the reflection maxima was in each case the same. The intensity of the reststrahlen of type (2) was the same as that of type (1). The reflection power of the third type, the pressed powders, depended inversely upon the size of the particles of powder. It is shown, that (in cases where no pressure is applied to the surface), the reflection power of a powder decreases as the particle size is made smaller.

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