. Carnegie Institution of Washington publication. 44 STUDY OF ABSORPTION SPECTRA " sol vent" bands when the photographic method was employed. Working in this way, even with the small dispersion of the glass prism, fairly definite indications were obtained of the existence of "hydrate" and "alcoholate" bands. It will, however, be necessary to use a spec- troscope with higher resolving power to bring out more clearly the exist- ence of "solvent" bands. Such a piece of apparatus is now completed. The curves in figure 19 present many interesting features. Th
. Carnegie Institution of Washington publication. 44 STUDY OF ABSORPTION SPECTRA " sol vent" bands when the photographic method was employed. Working in this way, even with the small dispersion of the glass prism, fairly definite indications were obtained of the existence of "hydrate" and "alcoholate" bands. It will, however, be necessary to use a spec- troscope with higher resolving power to bring out more clearly the exist- ence of "solvent" bands. Such a piece of apparatus is now completed. The curves in figure 19 present many interesting features. The intensity of absorption for neodymium chloride in 100 per cent water is much greater than that for neodymium chloride in 100 per cent alcohol. It can be stated, in general, that the intensity of the absorp- 100 90 80 70 o 60 a J a <u o & 50 40 30 20 10. NdCI3 41 N Depth 10mm .70 .75 .80 FIG. 19.—Wave-lengths. .85 .90 tion increases as the water-content increases. Neodymium chloride in water has a band whose center is at X = , and here the percent- age transmission is about 29. For neodymium chloride in alcohol it is nearly 50 per cent for the above wave-length. The transmission of neodymium chloride in water for this wave-length of light is therefore about 40 per cent less than the transmission for this same salt in pure alcohol. The ratio of intensities of the hydrate and of the alcoholate bands is about the same at , where the center of the second band for neodymium chloride in water is located. The much less intense neodymium water-band, whose center is at A = , is barely 30 per. 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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