. Carnegie Institution of Washington publication. n8 INFRA-RED EMISSION SPECTRA. tube. The two spectra are similar, with a sharp emission band at [i. Other maxima appear at 2, , , 5, and li. The general outline of the spectrum is similar to that of yttrium. Neodymium Oxide (NdO); Manganous Oxide (MnO). (Curve a, NdO; curve b, MnO; fig. 86.) The neodymium oxide was deposited in a thick layer upon a strip of platinum, by evaporation from a solution of the nitrate. The radiation curve shows maxima at 3, , and ll. Beyond 6 ll the emissivity is strong and not unlike that of c
. Carnegie Institution of Washington publication. n8 INFRA-RED EMISSION SPECTRA. tube. The two spectra are similar, with a sharp emission band at [i. Other maxima appear at 2, , , 5, and li. The general outline of the spectrum is similar to that of yttrium. Neodymium Oxide (NdO); Manganous Oxide (MnO). (Curve a, NdO; curve b, MnO; fig. 86.) The neodymium oxide was deposited in a thick layer upon a strip of platinum, by evaporation from a solution of the nitrate. The radiation curve shows maxima at 3, , and ll. Beyond 6 ll the emissivity is strong and not unlike that of cerium and thorium. The scale of emissivity is one-half of the curve for / 2 3 4 5 6 Fig. 86. — Neodymium oxide (a); Manganous oxide. 8/1 The manganous oxide was a grayish-brown color. The thickness of the layer upon the "heater-tube" was about mm. The radiating surface was a dull red. The spectral radiation curve is uniformly smooth throughout its whole length, with but a slight depression at 11 to be noticed in numerous oxides. In these two curves the sensibility of the instrument is different, as is frequently the case. Zinc Oxide (ZnO); Lead Oxide (PbO). (Curve a, ZnO; curve b and c, litharge (PbO), curves e and/, platinum; fig. 87.) The zinc oxide became a yellowish-green on heating, resuming its former white color on cooling. In spite of this selective emission in the visible spectrum, the distribution of energy in the infra-red is uniform, with the usual depression at ti. Lead oxide ("litharge") melts at a low temperature. On heating the color changes from orange to deep red. Curve b, fig. 87, shows the distribution of energy for the oxide after it had melted into a smooth mass and solidified. Curve c shows the emissivity. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original
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