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Abstract
It has been shown that crystals whose particle-size is small in comparison with the wave-length absorb but do not reflect within the region of selective absorption. It is suggested that within this region a powder ought to reveal an emission maximum. This suggestion is put to experimental test which shows that powder-films of quartz, barium sulphate and potassium carbonate show pronounced emission maxima. The behavior of quartz-powder is shown to be quite the inverse of that of a polished quartz plate.
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