. Carnegie Institution of Washington publication. 54 FLUORESCENCE OF THE URANYL SALTS. THE PHOSPHORESCENCE OF VARIOUS NITRATES. Observations were made on a series of nitrates previously prepared for the detailed comparison of the fluorescence spectra of that These consist of crystals with 6 H20 (rhombic), 3 H2O (triclinic), and 2 H2O (system undetermined) as water of crystallization and a speci- men sealed in glass which had been rendered as nearly anhydrous as was possible without decomposing the nitrate. The curves of decay indicate a much slower rate of decay for the crystalline form
. Carnegie Institution of Washington publication. 54 FLUORESCENCE OF THE URANYL SALTS. THE PHOSPHORESCENCE OF VARIOUS NITRATES. Observations were made on a series of nitrates previously prepared for the detailed comparison of the fluorescence spectra of that These consist of crystals with 6 H20 (rhombic), 3 H2O (triclinic), and 2 H2O (system undetermined) as water of crystallization and a speci- men sealed in glass which had been rendered as nearly anhydrous as was possible without decomposing the nitrate. The curves of decay indicate a much slower rate of decay for the crystalline forms than for the anhydrous nitrate. Whatever effect the amount of water of crystallization may have is doubtless masked by the far greater influence of the crystalline form. This is perhaps to be expected, since, as will be shown in Chapter VII, these specimens exhibit as great differences in the structure and appearance of their fluores- cence and absorption spectra as commonly exist between entirely distinct uranyl salts. Similar differences in the case of salts similar in composition but differing in crystalline form will likewise be described in a subsequent A — " E3 A . U1^ 1 FIG. 43. OBSERVATIONS ON POLARIZED PHOSPHORESCENCE. Certain crystals of the double chlorides of uranyl exhibit fluorescence spectra consisting of sets of bands polarized at right angles to one another. To determine whether these components after the close of excitation decay independently or without change in their relative intensities, the following experiment was made: A crystal of the rubidium uranyl chloride that exhibited the phe- nomenon of polarized fluorescence was mounted behind the disk of the synchrono-phosphoroscope and was observed with a spectroscope. 'Nichols and Howes; Physical Review (2), ix, p. 292. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illus
Size: 1651px × 1513px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorcarnegie, bookcentury1900, bookdecade1900, bookyear1902
