. Carnegie Institution of Washington publication. A X. B C D E A -185 iA FIG. 56. B?C Cf D D EE A A FIG. 57. The crystal was mounted so as to cover a transverse slot in the copper rod. It could thus be illuminated either from the front, as shown above, or from behind by light transmitted through the slot. The latter arrangement was employed especially in the study of the absorption spectrum. When the substance, excited to fluorescence in the manner already described, was gradually cooled to the temperature of liquid air and the spectrum was observed through the Hilger spectrometer, the fol- lo
. Carnegie Institution of Washington publication. A X. B C D E A -185 iA FIG. 56. B?C Cf D D EE A A FIG. 57. The crystal was mounted so as to cover a transverse slot in the copper rod. It could thus be illuminated either from the front, as shown above, or from behind by light transmitted through the slot. The latter arrangement was employed especially in the study of the absorption spectrum. When the substance, excited to fluorescence in the manner already described, was gradually cooled to the temperature of liquid air and the spectrum was observed through the Hilger spectrometer, the fol- lowing changes were noted: (1) The bands become narrower and better defined until at the temperature of liquid air they correspond in appearance to the usual line-like bands characteristic of the fluorescence spectra of the uranyl salts at low temperatures. (2) As the temperature falls the bands are gradually resolved into doublets. One component of each doublet becomes rapidly brighter, while the other frequently becomes more indistinct and sometimes disappears. The general effect is that of a shift toward the violet. 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
Size: 2125px × 1176px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorcarnegie, bookcentury1900, bookdecade1900, bookyear1902
