Investigations of Infra-red Spectra ...Carnegie Institution of Washington, 1906 |
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absorption bands acid Anhydrite Aschkinass bands at 1.5 brucite calcite cent Cleavage parallel Cleavage piece parallel coincide Colemanite complete opacity complex compounds containing water copper sulphate DATOLITE decreases dehydrated emission energy feldspar film fluorite glass Glauberite Hagen and Rubens heat Heulandite high polish Hydrotalcite infra-red investigation Kieserite Königsberger large absorption band large band Massive maximum mellite melted metals mica minerals containing mirror molecule of water moon nitrate noticed observed obtained Orthoclase oxygen and hydrogen P₂O Pfund Phys plates of rock pleochroism Potassium present examination prism quartz radiation radical radiometer radiomicrometer rays Reflection 20 reflection band reflection curve region rock salt Scolecite selective reflection selenite shifted silicates silver small bands Sodium solid solution spectrometer slit stibnite substance subtranslucent sulphur temperature thickness tion Transmission 30 20 Transmission 50 transparent visible spectrum water bands water of constitution water of crystallization willemite
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Pagina 103 - The interpretation of the results is based upon the assumption that if the union of the oxygen and the hydrogen in the molecule is similar to that in water, then the absorption spectra of minerals containing these two elements thus united should show the absorption bands of water superposed upon the absorption spectrum of the other constituents. On the other hand, minerals containing oxygen and hydrogen as water of constitution should not show the water bands, except hydroxyl groups, which should...
Pagina 18 - The dehydrated section, which is an opaque white mass, was then moistened with water and allowed to stand over night to dry and set, just as in the case of plaster of Paris. The result is shown in curve c, where the transparency at 6.9^ has decreased to almost the original value found for the transparent crystal.
Pagina 13 - ... spectroscopic data in two ways : (i) from consideration of intensities and ionization potentials of lines observed; (ii) from relative line intensities considering the processes of ionization, excitation, and recombination in detail. Because of a lack of data on...
Pagina 6 - The manner in which the water exists in the crystal is not understood. By some it is considered a part of the chemical molecule ; by others it is thought that the molecules of water exist in their entirety among the molecules which constitute the crystal.
Pagina 6 - On the other hand, the water which is given off only at a red or even a white heat can scarcely be present in the compound in the same manner as the water of crystallization, and is distinguished as •water of constitution.
Pagina 103 - On the other hand silicates do not have such definite bands, which would seem to indicate that the structure of the silicate radical is different in each mineral containing that element. The examination includes minerals of which the chemical constitution is in doubt; for example, talc and serpentine. The former is not supposed to contain hydroxyl groups while in the latter such groups are inferred. The present research supports these views in that the transmission curve of talc does not contain...
Pagina 103 - On the other hand, minerals containing oxygen and hydrogen as water of constitution should not show the water bands, except hydroxyl groups, which should show a band at 3 /*. The results show that of about 30 minerals containing "Water of crystallization" there are no important exceptions to the rule that they should show the bands of water. On the other hand the one important exception to the rule that minerals containing "water of constitution" should not show water bands is cane sugar.
Pagina 7 - ... perplexing question makes use of the results of previous work in which it was shown by others as well as by the writer that certain groups of atoms have characteristic absorption bands. Hence, if the oxygen and the hydrogen which enter into the composition of certain minerals as " water of crystallization " are united as they are in a molecule of water then one would expect to find the absorption spectra of such minerals to be a composite of the bands of water, and of the bands caused by the...
Pagina 21 - In Fig. 5 two curves of heulandite are given. The sections were about the same thickness and the great difference in transparency is due to the fact that the crystals were of different homogeneity and transparency. The curves show the presence of the water bands at 1.5, 2, 3 and 4.7 5 y.
Pagina 17 - ... and Anhydrite CaSOt. Of all the minerals, containing water of crystallation, studied, these two most conspicuously demonstrate the effect of the presence of water. It would have been desirable to study more minerals in the hydrous and anhydrous state, but none were obtainable. The artifically dehydrated minerals, such as copper sulphate, were too opaque for examination after expelling all the water. The only exception is a = CIear Section fa= Same partiaIIy selenite, the various curves of which...