. Carnegie Institution of Washington publication. AS STUDIED BY MEANS OF THE RADIOMICROMETER. 39 of neodymium chloride; it contains, for a given thickness, only about 90 per cent as much water as the same thickness of pure water. It is, then, obvious that in the longer wave-lengths a correction term must be introduced for this difference. This was practically negligible with salts of neodymium, since these do not seem to have any bands in the region where water has appre- ciable absorption. Salts of praseodymium have bands in the infra-red, at least as far as 2ju. In such cases the above corre
. Carnegie Institution of Washington publication. AS STUDIED BY MEANS OF THE RADIOMICROMETER. 39 of neodymium chloride; it contains, for a given thickness, only about 90 per cent as much water as the same thickness of pure water. It is, then, obvious that in the longer wave-lengths a correction term must be introduced for this difference. This was practically negligible with salts of neodymium, since these do not seem to have any bands in the region where water has appre- ciable absorption. Salts of praseodymium have bands in the infra-red, at least as far as 2ju. In such cases the above correction must be introduced. This correction can be introduced in either of two ways. We can take the specific gravity of the solution and from the concentration calculate the amount of water present. We can then use a "water" vessel of suitable thickness. For example, if the very concentrated solution in question contains only 90 per cent of water, and we use a vessel for the solution which is 10 mm. thick, we must use a vessel for the water which is only 9 mm. thick. In this way the beam of light is made to pass through the same amount of water both in the case of the solution and of the solvent, and the absorption due to water is, therefore, the same in the two cases. The second method of procedure is to allow the "water" vessel and the "solution" vessel to be of the same thickness, and to apply mathematically the proper correction to the results OAji Fig. 1. 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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