The Absorption of Infrared Radiation by Small Particles

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Abstract
The absorption of infrared radiation by small particles of quartz, calcite and ammonium chloride has been studied. For this purpose a special radiometer was constructed, with its vanes coated with the material to be studied. Evidence is brought forth to show that the crystals, when sufficiently finely divided, do not reflect well in their regions of metallic reflection. This offers a simple method of studying the absorption spectra in these regions. In addition, a new type of selective filter employing a radiometer seems possible, with preliminary experiments in accord with expectations.

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