. Carnegie Institution of Washington publication. 122 INFRA-RED EMISSION SPECTRA. which is not unlike that of cerium and thorium oxides, observed by Rubens. Smaller bands appear at , , and 4 fx. The calcium oxide was heated to a bright red before mounting it upon the heater-tube, and was apparently- free from the carbonate (fig. 92). Since there are no emission bands belonging to that substance, it appears that the water used in making the CaO into a paste was entirely 0/234567 Fig. 91. — Calcium oxide (a); (6); Tricalcium phosphate. The tricalcium phosphate has two marked emi
. Carnegie Institution of Washington publication. 122 INFRA-RED EMISSION SPECTRA. which is not unlike that of cerium and thorium oxides, observed by Rubens. Smaller bands appear at , , and 4 fx. The calcium oxide was heated to a bright red before mounting it upon the heater-tube, and was apparently- free from the carbonate (fig. 92). Since there are no emission bands belonging to that substance, it appears that the water used in making the CaO into a paste was entirely 0/234567 Fig. 91. — Calcium oxide (a); (6); Tricalcium phosphate. The tricalcium phosphate has two marked emission bands, at and li, respectively, and smaller bands at 2 /x and /«. The emission spectrum is unusually similar to that of apatite (fig. 75). A chemical analysis of calcium oxide, by Dr. H. C. P. Weber, showed no weighable amount of silica. This shows that the band at 11 is not due to silica. Calcite (CaCOs). (Curves a and b, fig. 92. Transmission, Carnegie Publication No. 65, p. 70.) The sample examined was a layer of finely ground white marble. The surface color in the two cases corresponded to about 9000 and 10000, re- spectively. The emission curve is of interest on account of the two types of emission it contains. In the region of /« calcite has a band of strong selective, "metallic," reflection. In this region of the spectrum the emis- sivity is proportional to the reflecting power, thus placing in the class with. 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 Carnegie Institution of Washington. Washington, Carnegie Institution of Washington
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