. Carnegie Institution of Washington publication. 128 INFRA-RED EMISSION SPECTRA. of gases. It is possible that for some wave-lengths the thickness of the radiator was not sufficient to emit a saturated radiation, and this may ex- plain why the emissivity at p. apparently does not follow the same law as do the other emission bands. In order to have a displacement of the maximum of emission, just as is known for solids emitting continuous spectra, it is necessary that the intensity of the emission at the short wave- lengths increase more rapidly than it does in the long wave-lengths. The
. Carnegie Institution of Washington publication. 128 INFRA-RED EMISSION SPECTRA. of gases. It is possible that for some wave-lengths the thickness of the radiator was not sufficient to emit a saturated radiation, and this may ex- plain why the emissivity at p. apparently does not follow the same law as do the other emission bands. In order to have a displacement of the maximum of emission, just as is known for solids emitting continuous spectra, it is necessary that the intensity of the emission at the short wave- lengths increase more rapidly than it does in the long wave-lengths. The [i isochromatic slants only a little less from the normal than does. 16 id Fig. 96. 20 22 24 Watts â Isochromatic radiation curves of oligoclase. ^= /<. In this region of the spectrum there is a weak general ab- sorption, while the other wave-lengths are the maxima of selective emission (absorption) bands, and it is possible that what corresponds to the emis- sivity constant a of a complete radiator is different for the two kinds of radiation found in this substance. It is possible that the isochromatic at n undergoes a sudden change, curving sharply upward, at a higher temperature. The same is true of the platinum isochromatic at 1 ft. In fact, it appears that the emissivity at \x must suddenly change in intensity, unless oligoclase is entirely different from the other substances examined; for, like the others, in the oxyhydrogen flame, it emits an intense. 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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