. Carnegie Institution of Washington publication. 8o INFRA-RED REFLECTION SPECTRA. from to p,, with maxima at , , and p,. The region from 12 to 13 /A is complex, with a maximum at p. In addition to this are sharp maxima at , , and QUARTZ (SiO2). (Curve b, fig. 64.) Section cut perpendicular to optic axis. The examination was made to compare the maxima of the silicates studied. The maxima (at and ,) agree well with those found by Rubens and Nichols, using a wire grating. The enormous reflecting power of 95 per cent at 9 /* 100 ofc. 3 9 10 II
. Carnegie Institution of Washington publication. 8o INFRA-RED REFLECTION SPECTRA. from to p,, with maxima at , , and p,. The region from 12 to 13 /A is complex, with a maximum at p. In addition to this are sharp maxima at , , and QUARTZ (SiO2). (Curve b, fig. 64.) Section cut perpendicular to optic axis. The examination was made to compare the maxima of the silicates studied. The maxima (at and ,) agree well with those found by Rubens and Nichols, using a wire grating. The enormous reflecting power of 95 per cent at 9 /* 100 ofc. 3 9 10 II I FIG. 64.—Diaspore (a); Quartz. a is 16JU. has been found only in quartz, and is slightly higher than found by others. In the silicates to be noticed presently it will be found that the bands found in quartz are shifted to new positions for each new com- pound examined. A new band which is unusually sharp and narrow was found at It is so very narrow that it seems more appropriate to call it a line instead of a band. Trowbridge measured the reflecting power of quartz at 9, 10, II, 12, and ju,, and found a rapid decrease to 12 /*, while the last reading is much higher, which increase he interpreted as being due to the band at. 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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