. Carnegie Institution of Washington publication. GENERAL DISCUSSION OF FLUORESCENCE SPECTRA. 11 ordinary spectroscope, has a spectrum which seems to consist of a single very broad band. A spectrophotometric study reveals, how- ever, two neighboring and overlapping bands. These have then- crests in the red and green respectively and are complex. (See fig. 3.) TABLE 1.—Approximate wave-lengths of visible crests in the spectrum of a phosphorescent strontium sulphide (Sr; Bi; Na2SO), No. 13. M- Visible crests 1/MX103. Intervals. M- Visible crests 1/MX103. Intervals. .4547 2257 2199 58 58 0
. Carnegie Institution of Washington publication. GENERAL DISCUSSION OF FLUORESCENCE SPECTRA. 11 ordinary spectroscope, has a spectrum which seems to consist of a single very broad band. A spectrophotometric study reveals, how- ever, two neighboring and overlapping bands. These have then- crests in the red and green respectively and are complex. (See fig. 3.) TABLE 1.—Approximate wave-lengths of visible crests in the spectrum of a phosphorescent strontium sulphide (Sr; Bi; Na2SO), No. 13. M- Visible crests 1/MX103. Intervals. M- Visible crests 1/MX103. Intervals. .4547 2257 2199 58 58 1909 2X58 4670 2141 58 5562 1793 .4801 2083 58 2X58 .4938 2025 .5921 1677 2X58 The components of the band in the green are members of a series having a constant frequency interval of 70 (see table 2), while the components of the band in the red form a series with an interval of L & K. No. 33. BA. CU. NA^ B4 07 -15 -10. FIG. 3. The two series overlap, as may be seen from figure 3. In this example the spectrum as a whole forms a heterogeneous complex made up of two homogeneous complex bands which are partially super- imposed. The fluorescence spectrum of commercial anthracene affords an example of a heterogeneous complex easily resolved into a group of. 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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